[Who is more powerful darth nox or the empires wrath]

Personally, I think Darth Nox is more powerful than Wrath, both Force and powerbase wise.

 

Force - Nox is already a powerful force user by his own right and has the aid of bound force ghosts and assortment of Sith sorceries and rituals, whereas Wrath is just an excellent duelist with above the average force power.

 

Powerbase - This is what really puts Nox leagues above Wrath. Nox is a Dark council member with major political influence in the Empire. Nox also has the command of an entire imperial fleet as well as the whole Imperial Reclaimation Service. Wrath has very little powerbase of actually political influence within the Empire and even less after the betrayal of Vitiate. Warth has been reduced to a pawn of Darth Marr by the end of SoR.

[Do you think sage / sorc dps should have their barrier ability removed / reduced?]

Let me guess OP, you don't main sorc/sage.

[Truce Mode]

I'd like to have a truce mode too, but bioware doesn't seem to be too keen on the idea as it has been mentioned before by various people on this forum.