If u wanna pvp and pve well I would recommend this: http://www.torhead.com/skill-calc#301oMZMcZfhrrzGGMs.1 AP spec would be very good in pve but I don't like it in pvp at all.

Why do you think you should get aggro from someone who has tanking stance and dps gear when you have same stance and tank gear? Ofcourse he's going to pull aggro from you because of the higher dps from his gear and then 'cause that same gear he cannot take the hit and your healer needs to heal like crazy....just sounds like a really bad way to manage ops. Little more dps would be nice since shieldtechs damage is pretty lousy compared to other tanks, I haven't had any problems with holding aggro in any Ops(got columni and some rakata gear) and mostly even heat is not a problem so I would say that the lower dps than other tanks is more of a pvp problem not pve.

U can upgrade lvl 50 blues to lvl 50 purples via RE...its just seems that the % is very small for it. It took me way over 100 REs to get the purples but the 'good' part is that 'cause ur REing blues there's only 3 different purples to get(critical, overkill and redoubt). The only problem is that with couple of days of Ilum and Belsavis daylies u get enough and better mods that anyone can make with bigger stats u get from pretty much anything anyone can craft(the rakata bop stuff is useful thou)...even the schematics from ops and hard modes are not up the bar with stuff that drops...they just need blue AND purple parts from hard modes and ops.