I've got an easier solution to the problem with the Lightening chisel being OP and making all the others obsolete for any traitline:

Make the melee crit rating on Martial Training into general crit rating. Give the lightening chisel 4% critical multiplier. The fire chisel could use some love as well though, icpr is kinda boring and useless atm. How about: +5% dmg on writ of fire, or +1 target on Fiery Ridicule?

A frost chisel would be cool as well, but I wont know what to give that as I have no idea what the intentions for the frost line are. (+2 aoe targets?)

For healing you can either use the writ riffler or the prelude riffler. Also, the finesse chisel would also be viable again for the moors.