I just hit lvl 40 and VG is far from what I just read. If your gear is lacking I'd start there, but I can say for sure that the VG AC in shield spec with the lvl 40 pvp tanking gear is nothing to scoff at or ignore.
Just to drive home my point, Champs are an easy solo with Elara and I've never come out of a warfront with less than 6 medals. The only thing I can think of that would hold you back would gear (like I mentioned), and resource management. Our mechanic is very very punishing if you get into the bottom 2 tiers of regen.
With my current gear, shield chance is 34% and absorb is about the same. It's a pretty tough class from what I've experienced so far.