Well I figured out my one footprint problem for the single op amp. The datasheet mentions model variations 01, 01R, and 01U. Well my part ended in 01T which was confusing to me, but looking at the digikey parts again, T is actually at the end of every part number. I think I must have laid out the footprint for the 01U, but ordered the 01 variation. So I ordered the 01U variant and I'll put that on the board and try out my original design without feeding a PWM signal into the board for reference. Maybe that might solve some of my noise issue I was having during initial testing. I'll have to probe it with the scope as well to see if the noise is just in the micro, or if its coming from the board/test setup. I can play around with extra filtering too before I try the code based ADC noise fixes.