I got fed up with messing around trying to trick the stock ECU to make the correct boost with my much modified from stock (subaru) intake and exhaust so I have now fitted a Gizzmo MS-2 electronic boost controller. This has closed loop boost control as well as turbo timer and FCD (which I won't be using). It now finally makes 1.1 bar without overshooting and hitting the fuel cut but I will still be playing with the rate at which boost comes in. I had a second ashtray surround which I welded up and modified to fit the Gizzmo controller. It certainly feels a lot quicker now so my times will undoubtedly be better!
Cheers for the Gizzmo recommendation Wally