Hello there. I am not a templar expert, I just have one with squire 3 for guild utility.
If you want to use two handed swords and do some damage in your build, I would suggest you to modify your build a bit. The main one is to sacrifice barbarian 3 and templar 3 :/, and take sword 1, highlander 3, barbarian 1, doppel 3 and templar 2 route. We mostly use barbarian for cleave slash damage bonus for doppel and highlander skills, and also mortal slash. You can eve use doppel c3 zwerchau for boosting damage on cloth and leather targets with those skills. Barbarian 3 with frenzy and warcry with atttibutes would be nice (you could extend +10s the debufffs duration with warcry on c3) but you would rely mainly on the doppel skills alone. Highlander crosscut+skyliner combo, crown moulinet combo and vertical slash brings a quite good filler damage while your doppel skills are on cooldown. You could also use cliclone with battle orders for high movespeed while spinning 
This is just a suggestion, but I would consider because the arenβt a lot of builds with templar that do have good damage 