Increase the feedrate. You have it set to 15ipm in line N45 (F15.0)
I think we went over this before, but when you lower the accel and velocity and it stalls, it's probably due to resonance.
Also, when it cuts too deep, be sure to check the Z DRO and see what it says.
Most likely, the Z axis is stalling when it should be moving up. The cumulative affect is that the Z goes too deep.