try looking into these options:
1. Turtle cap
2. Double strapping your mask with thick straps (KM has some nice thick ones)
I've worn a Tcap and been hit. You don't really feel it at all. Hundredth monkey is making them now as well
on the straps: I double strap my masks and when I get hit in places like the back of the head, it's much more likely to hit the strap and diffuse the hit.