Luke, from what little I know, I'll say that 0.9mm is far too big a jet for that kind of power and boost! Our cars are not too far apart and I'm running 15.4psi boost for 281bhp/302lbft with Emerald and also using 75w/25m mixture.
I'm using a 0.5mm jet set to activate at 1bar with 440cc injectors.
I'd play around with smaller jets.
