I'm running 14 PSI at 5,000 RPM and when it gets to around 6,000 RPM a MASSIVE boost increase happens - Rob can confirm this weirdness. However, the Engine cut out has been fixed after Rob and I changed the Sparkies. I think the gap was 0.8 (Rob can confirm).
Surely 14 PSI is unsafe - I was planning to get a R32 GTR Accularator (Spelling?) which will give me 10 PSI.