Take a look at my numbers in
this thread then if you could. Make sure they make sense.
Basicly, I'm looking for the probability to damage your opponent per attack given the attack, defence, toughness (Damage save), and damage (Damage save DC) modifiers of a PL 10 character. You can take a +1 on one to take a -1 on the other on 2 axis. Defense/Toughness and Attack/Damage.
Defence is your AC, so you add 10 to your defense to get it, but that's it (since you're talking max possable). The DC of the toughness save is 15+Modifier.
I'm pretty sure I did it right, but check and make sure please
you can e-mail me with any questions.