Fitted it this afternoon, went out for an hour or so to get it mapped safe for driving and the results are interesting...

At 16psi the car now needs the same amount of fuel as my previous .36/50 did at 26psi so the VE of the engine has increased massively!
But.. It wont hold more than about 16-18psi!! My AVC-R is at around 70% duty to hold that and if I try for anything more like 21psi then I get terrible surge going from 21psi down to 16psi then back up again... What could my restriction be?
I'm on a stock exhaust manifold so should have no problem getting rid of the gasses as they flow for 350bhp+, my head is a NMS head with the Newman off the shelf RST cam and lifters so shouldnt be them either?!
The engine breathes fine right to the limiter of 6600rpm still needing plenty of fuel (VE doesnt drop off like it did on the .36/50) so I dont see a problem getting air into the engine, it looks like typical turbo surge with exhaust gasses struggling to get out.

Thoughts and opinions welcome as always....