I had installed the 3.13.2 RC1 firmware and MMU 3.0.1 updates late last week to see if I could resolve my issue. After letting the MMU crash, I adjusted the tuner to all settings, retesting homing each time, and none of the tune settings helped my situation. I disassembled my MMU to ensure everything was aligned and tightened correctly, but didn't have the chance to try again since then. If the reassembly doesn't help, I'll have to just downgrade the firmware and leave it there I guess.