OP: As suggested correctly by slappy, actuator preload is the key, so you may have been the cause of your issues, BUT, Jabba should also have done more to sort this.. It would be obvious... I find these, so no excuse why they cant.
Dave: As dan's asked I am intrigued to what airflows yours does. I have done many hybrids.. and they are sensitive to their surroundings and supporting mods. Winding up the boost is not the answer, they just get too hot. If you have a log of its airflow that might shed some light onto whats occuring. And for the record, CR is significant......
EDIT: just seen you post 256g/s..... is that a real number or just divide .8 as its very close to 320bhp so on the money..
Do you run water meth? I dont remember. I say this as cars which have run wmi, and hybrids always have made more power from less boost (= less heat)