That solved it...much better results now....94% to 103%. AGC is now 96.
Duet3D rotating magnet filament monitor v3 on pin io2.in, enabled, sensitivity 26.92mm/rev, allow 1% to 200%, check every 3.0mm, version 3, mag 132 agc 96, measured sensitivity 25.21mm/rev, min 94% max 103% over 1721.6mm