The guys have retuned and added some more boost. Unfortunately when the engine was rebuilt, it's come away with too-high compression, so it's pingy unless they back right off the ignition timing. Still I'm happy with 212kw at 19psi.
Will look at a thick head gasket and/or e85 next year. Can't stomach the thought of another rebuild!
Just need some tyres and I'll be ready for MTC2016!