I’m not going to go back and read thru the whole thread....... but I thought the new Proform body was running noticeably less MPH than the Demon body.
If that’s the case, and the new body is no more “bog free” than the Demon........ it just means you have another issue to deal with.
The bog........and a big main system calibration problem.
I say “big” because if it were close it wouldn’t be popping and losing multiple mph.