vert linearity looking much better.
https://imgur.com/gcteUfS
found bad resistors.
https://imgur.com/5c1EP28
r58 r59
way WAY off, they had been replaced before, but are still no good.
had 1/2 watt ones in there, put in 1 watts
https://imgur.com/jduVGCo
REALLY BAD
will prob find other very bad resistors too :/