Has anyone attempted an upgrade to Marlin 2.x on the 2S yet?

Has anyone had issues getting the y-axis offset calibrated on the dual head extruder? My single material prints are beautiful but the second nozzle is about +1mm off in the y and I have tried modding the offset in the firmware by 2mm and it is still the same, like it had little to no effect. Is there anything else I have to adjust to make it take? I already adjusted my z-offset with great success.

For all points Y0, the center of the probe is off the build plate by about 1.6in. When hotend #2 is selected and the DSE is moved to Y-home it pinches the cables for hotend #1 against the wheels on the Z-axis rollers and bracket with no where else to run them. The Y-home position is not mechanically adjustable like the X-axis and I can't see how software tweaks would help so I'm at a loss for how to fix this issue. Ideas are appreciated.