Regarding the question of brokenness:
LVL 12, +15 AB, 1d10+18 = 23,5
An average lvl 12 NAD = 12 + 12 = 24, so he needs a 9 to hit.
dpr w/o crits: 0,6 * 23,5 = 14,1 dpr
CharOp says you should do your level +3 dpr if you're not a striker. A striker should do 2*level +6. A broken striker should do...