Well I just ran
Room temp bed G32
Bed probe heights: 0.345 -0.136 0.308 0.302 -0.233 -0.201 -0.018 -0.385 -0.098 -0.021 0.223 0.127 -0.085 -0.134 -0.135 -0.095, mean -0.015, deviation from mean 0.208
60C bed G32
Bed probe heights: 0.495 0.039 0.471 0.477 -0.095 -0.076 0.132 -0.260 0.015 0.091 0.335 0.227 0.053 -0.047 -0.035 -0.008, mean 0.113, deviation from mean 0.219
So that doesn't look great. And I just noticed that the X carriage seems to have a lot more friction and resistance to movement than the other two carriages. I didn't notice before I guess because the belt tension was so much higher than the other belts. Now it is quite obvious so…off to figure out why it is significantly worse.