Hanaldo,
Some advice for you... The allstar graph has correction turned on so that adds about 6% on that dynos normal figure. then there is a difference between roller and hub dynos so you loose more with that difference so a genuine 320rwhp may be a more accurate figure. Which is, lets not get mixed up with words, a totally crap result!
Now, the issue with the ecu. My mate had very similar issues with his r34 and power fc. Took him and Sean ages to work out a fix but I believe it was something to do with the traction control. Maybe ask Sean if he remembers how they fixed brads issue, otherwise ill try get brad on here to give you some advice.
Unfortunately if you do get the issue fixed and you don't make substantially more power and response it looks like you may have got a dud set up :-(
Simon