Ok, my worthless thoughts.. why I'm posting I have no idea, other than I feel the FL love and need to do something. 
i. 12k hands means the impact of variance is still significant, so variance is clearly (and I guess, obviously) responsible for a large portion of the result.
ii. A turn cbet stat of 91% with a WTS of 35% suggests you are second barrel/folding a lot, although at 60% river cbet.. perhaps you are 3 barrel bet/folding a lot as well.
iii. At $2/$4 I would expect your "Fold BB to steal" stat to be tending to 45 - 50%. You may be folding profitable multiway hands - but at 12k hands it may just be sample size.
Ultimately though, running at -4.4BB/100 for 12k hands is standard variance. I've been through much longer, deeper and horribilier [made up word, don't use] runs than this at much lower limts (ie $.50/$1 on iPoker).
BTW, if you don't already, you should get behind Los Pumas (I hope that is the correct way of writing it; [ ] basic knowledge of Spanish) ie the Argentinian rugby union team. The rock, and so do their female supporters. Grrrrrrl.