Yeah mate. Not much else the tuner can do with it other than get a turbo that's matched better to the motor. TD42 just don't rev high enough to utilise the turbo's optimum range, which I can only assume is from 2000rpm to 4000-ish.. maybe more. Again, engine doesn't rev that high easily. (well I dont like too anyway).
Currently teeing up an A.R.E Intercooler from a bloke fingers crossed.