Don't spec defensive. Soloing heroics 2-7 lvls lower than I am I still spec offensive. With two of you you'll down stuff so fast anyway plus it'll be easier to take aggro from her if you want to tank. Besides you can get most defensive aa's while you spec for offense anyways. Put as much in both as you can but max offensives in the brawler tree. Bruiser tree all offensives till you can get bodyguard of stone.