If you have full war hero set, first of all grats! It takes a lil'while to get that.
What I'd suggest is saving yer comms for the wh vindicator sabre(2000rwz comms), and then removing the mods/enhancements from sabre. Remove all mods/enhancements from existing gear(keep the old ones), and replace with the new power/surge sabre ones. Keep doing this until all crit/accuracy existing mods are replaced.
Best way to get more power is to replace expertise crystals with power ones.
I have already done that.. a couple times, and with the offhand.
There is seriously nothing for me to spend comms on anymore
which is why i think i could do more dmg if i swapped expertise for str.
but i dunno if i wanna swap str for power either