@yetanotherusername Well, solved it!
I highly suggest people in the future looking at this issue to read carefully the Sensor stall detection documentation.
The fix was about adding more juice to Y.
In homey.g (and homez.g too):
G1 H1 Y-225 F3600 ; move quickly to y axis endstop and stop there (first pass)in 00-Functions/CurrentSenseHoming:
M913 X50 Y50 Z60 ; set the x, y, and z drivers current percentage for non-print moves, per config.gI gave a +10 to Y, because the original was Y40.