This is pretty interesting. I quit playing Madden a few months ago but I set out on doing my own slider testing.
I noticed it was nearly impossible to force bad passes because as I adjusted CPU QB ACC, the game got easier. I mitigated this issue by creating tighter pressure, getting the CPU to take risks, and letting contested catches determine CPU accuracy numbers.
Wish I would have read your postings Josh, I spent a lot of time on that without finding the cause lol!