@ Evan - its the same in vocations, I tried to change so masters/elders could gain their mlvls a little faster than non-promoted, and the resoults were that they gained a mlvl with every spell they did..
@ Sizaro - I had the same problem once, also cause I changed the value of the multiplier, so my suggestion to you is to keep it as it is (=1), and maybe find a code which changes the values of the crit in the sources