A screenshot would be nice.
Anyway, the +5% is indeed max, what a license can add, and there's also no other way to add crit to a weapon.
Though I just started wondering that maybe the license for the mobs in Adealia adds more. Since there's so much new content and everything.
Ima check that later from the files.. o.o
Edit: Nope.. still is 5%. Oo