I found this post confusing.
Are you using the LM-1 PID ({EXT.AD}*10) with different analog output settings?
If this is the case these settings:
0.88333v @10:1 AFR
4.21667v @20:1 AFR
are the same as:
0.00000v @7.35:1 AFR
4.21667v @20.00:1 AFR
Which is the same as ({EXT.AD}*3)+7.35 and matches the LC-1 PID not the LM-1 PID of ({EXT.AD}*10).