Need more stick range shrink on calibrating Ginfull hall effect pot

[yoho2chn]

I recently got latest Ginfull hall effect green pot(not the orange pot), which states direct fit into APLS oem stick and it does.
Up one calibrate stick range on this hall-effect pot, initially it came will overshoot square cut range, but even after calibration, stick range still has quite some room to improve. Not sure if its due to the code or it will be the best can do on this type hall-effect pot.

[yoho2chn]

I believe this "issue" can be closed/ignored since TMR sensor from Gulikit released and it has been proven by every direction batter than traditional Hall effect sensor.