Redesigned "caar loop pre-boundary exchange", tuned for Frontier #429

Job	Run time
ci (SMS_D_P4.ne4pg2_oQU480.F2010.singularity2_gnu)	2m 52s
ci (SMS_D_P4.ne4pg2_oQU480.F2010.singularity2_gnu)	1h 3m 16s
ci (SMS_P4.ne4pg2_oQU480.F2010.singularity2_gnu)	2m 32s
ci (SMS_P4.ne4pg2_oQU480.F2010.singularity2_gnu)	21m 56s
ci (REP_P4.ne4pg2_oQU480.F2010.singularity2_gnu)	31m 27s
ci (REP_P4.ne4pg2_oQU480.F2010.singularity2_gnu)	31m 27s
ci (ERS_P4.ne4pg2_oQU480.F2010.singularity2_gnu)	41m 59s
ci (ERS_P4.ne4pg2_oQU480.F2010.singularity2_gnu)	41m 59s
ci (ERS_P4.ne4pg2_oQU480.F2010.singularity2_gnu.eam-wcprod_F2010)	40m 30s
ci (ERS_P4.ne4pg2_oQU480.F2010.singularity2_gnu.eam-wcprod_F2010)	40m 30s
ci (ERP_P4.ne4pg2_oQU480.F2010.singularity2_gnu)	48m 12s
ci (ERP_P4.ne4pg2_oQU480.F2010.singularity2_gnu)	48m 12s
ci (PET_P4.ne4pg2_oQU480.F2010.singularity2_gnu)	56m 41s
ci (PET_P4.ne4pg2_oQU480.F2010.singularity2_gnu)	56m 41s
ci (PEM_P4.ne4pg2_oQU480.F2010.singularity2_gnu)	31m 36s
ci (PEM_P4.ne4pg2_oQU480.F2010.singularity2_gnu)	31m 36s
	9h 51m 26s

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