The feed rate is in %, not IPM. And the clipping you are seeing is the parameters ,(Max XY) and (Max Z) velocity, that are easily changed in the Setup>configure machine>contouring Tab.
I tested the code on a machine in my shop, and it didn't loose steps. Its possibly one of the older stepper drives loosing the steps, but if changing that line of code fixes it, then thats easier.
Also, Its strange that CamBam puts 2 , Z rapids in a row like that. Shouldn't the 2nd one be a feed (G01) ?