I'm not an expert, but as a "rule of thumb" stock cast pistons are limited to around 5 lbs boost if the tune is perfect. If you were up around 7-10 that's too much. Also, 11.7 AFR is pretty rich... but may not be rich enough under full boost. The meth injection will help there. Hopefully you can also tune to get higher AFR under low load/cruising to improve efficiency and reduce engine wear.

For 7-10 lb, I'd suggest a shelf stock forged piston minimum in the compression ratio of your choice with ring gaps set for boost (wider).