Hey man, those results are not not bad at all. Matter of fact 12.6-12.7 is possible, and your running low boost!!. If you need more injector, get some 650's and turn up the boost to 20-21psi. If you wish not to up the injectors, try getting tuned on a better gas so you can run more timing and lean her out a bit. I think with good gas 12.4's are not out of the question (carefull with the trans!).
On the other hand, injectors plus better gas, and low 12's here you come