diff --git a/nnef/src/ser.rs b/nnef/src/ser.rs
index 838999aa38..3168b88871 100644
--- a/nnef/src/ser.rs
+++ b/nnef/src/ser.rs
@@ -12,9 +12,18 @@ pub fn rewrite_model(model: &mut TypedModel) -> TractResult<()> {
             "rewrite_deconv_with_n_axis",
             tract_core::ops::cnn::rewrite_deconv_with_n_axis,
         )
-        .with_rule_for("rewrite_kernel_conv_in_oihw", crate::ops::nnef::ser::rewrite_kernel_conv_in_oihw)
-        .with_rule_for("rewrite_kernel_deconv_in_oihw", crate::ops::nnef::ser::rewrite_kernel_deconv_in_oihw)
-        .with_rule_for("rewrite_consistent_quantized_conv", crate::ops::nnef::ser::rewrite_consistent_quantized_conv)
+        .with_rule_for(
+            "rewrite_kernel_conv_in_oihw",
+            crate::ops::nnef::ser::rewrite_kernel_conv_in_oihw,
+        )
+        .with_rule_for(
+            "rewrite_kernel_deconv_in_oihw",
+            crate::ops::nnef::ser::rewrite_kernel_deconv_in_oihw,
+        )
+        .with_rule_for(
+            "rewrite_consistent_quantized_conv",
+            crate::ops::nnef::ser::rewrite_consistent_quantized_conv,
+        )
         .rewrite(&(), model)
 }
 
@@ -342,25 +351,21 @@ impl<'a> IntoAst<'a> {
         force_variable: bool,
     ) -> TractResult<Arc<RValue>> {
         let mut name: Identifier = name.as_ref().into();
+        let have_tract_core = self.ensure_registry(&"tract_core".into()).is_ok();
         if !force_variable && tensor.len() <= 8 {
             if tensor.datum_type() == String::datum_type() {
                 return Ok(Self::dump_rec_tensor(&tensor.to_array_view::<String>()?, |f| {
                     string(f)
                 })
                 .into());
-            } else if tensor.datum_type() == DatumType::F16 {
-                return Ok(
-                    Self::dump_rec_tensor(&tensor.to_array_view::<f16>()?, |f| numeric(f)).into()
-                );
             } else if tensor.datum_type() == DatumType::F32 {
                 return Ok(
                     Self::dump_rec_tensor(&tensor.to_array_view::<f32>()?, |f| numeric(f)).into()
                 );
-            } else if tensor.datum_type() == DatumType::F64 {
-                return Ok(
-                    Self::dump_rec_tensor(&tensor.to_array_view::<f64>()?, |f| numeric(f)).into()
-                );
-            } else if self.ensure_registry(&"tract_core".into()).is_ok() {
+            } else if have_tract_core && tensor.datum_type() == DatumType::F16 {
+                let array = Self::dump_rec_tensor(&tensor.to_array_view::<f16>()?, |f| numeric(f)).into();
+                return Ok(invocation("tract_core_cast", &[array], &[("to", string("f16"))]));
+            } else if have_tract_core && tensor.datum_type().is_integer() {
                 if let Ok(value) = tensor.cast_to::<i64>() {
                     let value =
                         Self::dump_rec_tensor(&value.to_array_view::<i64>().unwrap(), |i| {
diff --git a/test-rt/test-f16/suite.rs b/test-rt/test-f16/suite.rs
index 0ba641798b..f98cbe15a3 100644
--- a/test-rt/test-f16/suite.rs
+++ b/test-rt/test-f16/suite.rs
@@ -1,4 +1,5 @@
 use infra::Test;
+use suite_unit::conv_q::{QConvProblem, QConvProblemParams};
 
 pub fn suite() -> &'static infra::TestSuite {
     lazy_static::lazy_static! {
@@ -13,16 +14,81 @@ fn mk_suite() -> infra::TestSuite {
     onnx.ignore(&ignore_onnx);
     let mut unit = suite_unit::suite().unwrap().clone();
     unit.ignore_case(&ignore_unit);
+    unit.get_sub_mut("conv_q").add_arbitrary_with_filter::<QConvProblem>(
+        "proptest",
+        QConvProblemParams::default(),
+        compatible_conv_q,
+    );
     infra::TestSuite::default().with("onnx", onnx).with("unit", unit)
 }
 
-fn ignore_unit(_t: &[String], _tc: &dyn Test) -> bool {
-    false
+fn ignore_unit(t: &[String], case: &dyn Test) -> bool {
+    if let Some(qcp) = case.downcast_ref::<QConvProblem>() {
+        if !compatible_conv_q(qcp) {
+            return true;
+        }
+    }
+    let [section, _unit] = t else { return false };
+    ["q_flavours"].contains(&&**section)
 }
 
 fn ignore_onnx(t: &[String]) -> bool {
-    t.last().unwrap().starts_with("test_logsoftmax_large_number")
+    r#"
+test_averagepool_2d_ceil
+test_averagepool_2d_pads_count_include_pad
+test_averagepool_2d_precomputed_pads_count_include_pad
+test_averagepool_2d_same_lower
+test_cast_STRING_to_FLOAT
+test_castlike_STRING_to_FLOAT_expanded
+test_constantlike_ones_with_input
+test_constantlike_threes_with_shape_and_dtype
+test_constantlike_zeros_without_input_dtype
+test_cumsum_1d_exclusive
+test_cumsum_1d_reverse_exclusive
+test_cumsum_2d
+test_dequantizelinear
+test_dropout_random
+test_dynamicquantizelinear
+test_dynamicquantizelinear_max_adjusted
+test_dynamicquantizelinear_min_adjusted
+test_gemm_broadcast
+test_gemm_nobroadcast
+test_maxpool_2d_ceil
+test_maxpool_2d_same_lower
+test_maxpool_with_argmax_2d_precomputed_pads
+test_mod_broadcast
+test_mod_int64_fmod
+test_mod_mixed_sign_float16
+test_mod_mixed_sign_float32
+test_mod_mixed_sign_float64
+test_mod_mixed_sign_int16
+test_mod_mixed_sign_int32
+test_mod_mixed_sign_int64
+test_mod_mixed_sign_int8
+test_mod_uint16
+test_mod_uint32
+test_mod_uint64
+test_mod_uint8
+test_matmulinteger
+test_nllloss_NCd1d2d3_none_no_weight_negative_ii_expanded
+test_nonzero_example
+test_quantizelinear
+test_qlinearmatmul_2D
+test_qlinearmatmul_3D
+test_reduce_prod_default_axes_keepdims_example
+test_reshape_reordered_dims
+test_resize_upsample_scales_linear_align_corners
+test_resize_downsample_scales_linear
+test_unsqueeze
+"#
+    .trim()
+    .lines()
+    .any(|s| t.last().unwrap() == s.trim())
+        || t.last().unwrap().starts_with("test_logsoftmax_large_number")
         || t.last().unwrap().starts_with("test_softmax_large_number")
         || t.last().unwrap().starts_with("test_resize")
-        || t.last().unwrap() == "test_reduce_prod_default_axes_keepdims_example"
+}
+
+fn compatible_conv_q(qcp: &QConvProblem) -> bool {
+    qcp.qp.iter().all(|t| t.len() == 1)
 }