How slow was your ROF exactly?
Granted you were putting way too much load on your motor, but with an 11.1v LiPo your ROF should be no less than 1200rpm at the very least, and with high speed gears should be up in the 1600-1800rpm range.
As stated, buy proper gears and a proper spring for those gears
Get a full tooth piston instead of a half rack
Shim your gears properly
And install a MOSFET switch since your LiPo is going to destroy your trigger contacts
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