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STOP TRYING TO SHOOT THE GUN.
once that crunching noise happens stop shooting (too late for you but for future reference)
semi or fully don't matter, the gears do the same thing, there's just an extra bit that happens in semi to reset the circuit so it stops firing. This process was interrupted, didn't occur or was ineffective... meaning the mechanism is worn or the trigger portion that the mechanism resets was physically stuck and not releasing to break the contact, causing your run away.
Your crunch noise has not so much to do with that... it's just the gears tried to cycle before the piston was full forward again. STOP TRYING TO SHOOT THE GUN.
You'll almost definitely need a new piston, and inspection/replacement of the cutoff lever.
Possibly new gearset depending on damage... hard to say what you've done to the geartrain with all the shooting through compression jams and PME.
Take it to a reputable tech.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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