ok cheers,
im a bit fed up with tuners so far, if he cant sort it ,then thats two tuners who have let me down regarding my boost problem. 1st was msd they diagnosed weak valve springs, which i have since replaced.
mikeanics also mentioned valve springs untill he realised they head been replaced. they now think its a turbo related problem ? i thought they meant it may be faulty but they may have meant what you have mentioned.
if it is the issue you have suggested then i would be happy to have less psi for better boost throughout the rev range.
could this cure it ??
many thanks