Debilitation is bugged in pvp. Still great talent when it works.
Go 2/2 in Righteus Zeal. Get 2/2 Displacement, its great for pvp.
Defensive roll and Temperance are situational talents, not worth it imo.
As for rotation BS and MS are your hardest hitters.
Not using MS for normal mobs is ridiculous since it has a very short cd. Use BS and MS after PS for maximum effect (usually this means 2 dead normal mobs or close to it).
Cauterize is a very good ability for Combat since its only two focus and its total damage is similar to Slash. Not worth using on normal mobs since they wont be alive long enough for the dot to run its course but for bosses/elites/pvp it's great. DPS will come down to damage per focus as focus generators don't hit very hard.
Blade rush replaces Slash in every situation as far as I can tell.
From the way you describe your action bar layout I get the feeling you're a clicker. That is incredibly bad for melee especially since that pretty much makes you a keyboard turner as well. Try practicing binding everything and unbind turn left right and backpedal. Strafe everywhere. A good melee player will not get hit (not ever once) by a keyboard turner if lag is good. You might get away with clicking as a range or a healer in pve (still will have trouble in pvp) but as a melee you can't do it if you want to be successful.
Also after you get Doc the questing becomes incredibly dull as it's almost impossible to die doing normal quests.