Tom,
The jam that occurs at the 1:14 mark in your first vid is the type I have been having with my 3AT - ie, case stays stuck in the chamber a bit and the next round sticks on it - in some cases the empty isn't removed at all.
Then again I can have 2-3 flawless magazines worth before it starts again.
Posted prob on here a bit ago, most suggested calling Kel-Tec but haven't had enough time off from work to even put in a call to Kel-tec during business hours.
I'm thinking limp-wristing on my part, but can't get enough range time to confirm or discount, sigh - Jobs, those annoying 8 hours before happy hour - because by then all the ranges are closed