Ok I always assumed each tic on an aoe hit but after some testing seems you might be right (using bloody storm not Terms of Service but tics should work in same way).
I tried 72 defiler vs lvl 81 mob and sometimes only 7 hits were successful and one time 11 (even though i thought 10 was max with 20 sec duration :/).
So after that that initial test it seemed like lvl difference was important...but then i tested on a lvl 72 mob and was only getting 7 or 8 successful tics.. so idk what to think.
Lvl probably does make a little difference to success but not much, would need to test a lot more to reach a conclusion.. lvl difference doesn't seem to make much difference anyway.
lvl difference dont make any different, Terms of Service failed sometimes at 60er mob with 70+ so -.-
and the aoes --- idk sometimes 5 or more sometimes 10