After having a complete head replacement thanks to AUDI on my PD170 TDI I'm finding that the car seems to lack low end boost, when it gets moving it has a good amount of pull but the initial kick just isn't there any more. I've done several runs & logged the data in VCDS & they all appear to show the same result. Below is a run in 5th gear from around 1400rpm to 4200rpm, logging engine measuring blocks 003, 010 & 011. As you can see the requested boost vs actual boost at low end is well off & the spike is totally missing. I've tested the turbo actuator which is ok, EGR is ok, MAF is ok, vacuum lines all appear to be ok, what could be causing this lack of low end grunt? Does this mean the turbo is wrecked? Thanks in advance.