I would be interested in knowing ripped track lengths vs AMD/Rovi specified track lengths. I wonder if the original rips are 'contaminated' in some way such that they don't match those in AMD.

Could it be that the 100 or so that do work were ripped by another method?

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).