HAHAHA...thanks for the good giggle guys. Last I checked stripped is stripped, and first or last doesn't matter much. And yes, relieving pressure on all other screws will make the last screw tighter because the head will lift and put even more pressure on the single screw. That's why you just "crack" each screw and reseat lightly before actually loosening them

Tap and EZ-out or drill the head of the screw off (stop when you get to the engine's head and go easy and let the drill do the work), or using sharp needle nose pliers from the side... if that's even possible with your head. One of those will get it.