Another update from John... He's been figuring out why the boost isn't building as quickly as designed. Seems the intercooler is restricting flow. Without the intercooler it's building 0.2bar extra through the range and building boost quicker.
An intercooler redesign is a bit of a pain in the ass at this late stage, so have asked John to finish the build as it is. Means I will end up custom building a new cooler at some stage... Not sure if the Predator will then dynamically adjust to extra boost through range and quicker rise... or not? A project for after I get the car home I guess