So I did some more testing and I did 50 attack rolls with a new character and the calculated avg. was 6.04 but this time there were the occasional >10 roll, so I guess there isn't that hard limit I thought there was when I was testing before.


ATTACK ROLLS:
3+7+6+4+3+8+3+8+6+5+3+5+2+9+8+6+8+7+5+1+17+4+8+7+1+2+9+8+1+1+5+6+4+8+15+6+7+5+2+6+17+19+4+10+1+4+1+3+5+9 = 302/50 = 6.04.
To clarify, these are the primary rolls, i.e. not the adjusted values after bonuses and penalties.
This looks like some sort of bug considering I made a new character and everything.
I'll keep testing and see how this develops.