i have to disagree with the above, although this tuning thing isnt my game lol.
upping the fuel pressure works but it is a cheat! imo you would be better to fit the correct sized injectors for the job in hand and run them at the appropriate pressure.
dont know whether your getting your wires crossed here caner, but this is what steve told me when mapping my car, and i ended up binning the adjustable pressure regulator i had fitted and going back to standard which is good to run nigh on 2 bar of boost 'proven on many cars, and i could have ran 2 bar on my own car with it' and thats much more boost than you are ever likely to run!
im not saying this to flog you a set of injectors, but relaying things which i have learnt the hard way.
do the job properly and fit the bigger injectors, but if im correct and you only want to run 1.2 bar boost then the standard stuff should be fine at that level unless you have a problem with
a) either a worn fuel pump
b)worn or sticky injectors
c) a faulty existing fuel pressure regulator, which may not be holding the pressure!