SR + TD06 wont hold boost

[Hypnotik]

I'm having the same problem again that I had when we tuned my car. The boost spikes up to ~1.3-1.4 bar then falls back to 1bar(actuator pressure). I had a Greddy manual boost controller then and now I have a brand new Blitz DSBC Spec R and it still does the same thing. Scott(my tuner) said he doesn't think the compressor is big enough but I've seen dyno sheets of this turbo at 1.7 bar. I'm 98% sure I don't have any boost leaks. Could I need bigger cams? I have 256's. Ideas?

 

[LuPix_S15]

I'd have a good look at the actuator... is it an uprated one? At the very least I'd check whether it's functioning ok and seems strong enough to hold higher boost.

1.0 bar deffo doesn't seem right for a TD06!!!