Aim for 11 at WOT and go from there. 11.5 without meth on 94 is pushing it past what I'd consider the safe zone. I wouldn't ever go much past there (MAYBE up to 11.2 once it's all dialed in) unless switch to race gas or meth.

Once you get it dialed in at around 11 then you can work on adjusting timing and boost. First get boost to where you want it (you may have to back the timing off first, especially if running the stock map which is very aggressive). Once you have the AFR and boost you want then start dialling in timing.