yeah you should be all in by about 4000rpm with that turbo. take a look at the plot for boost, it just keeps climbing and climbing till redline, it should shoot straight up as early as possible, then hold flat at 16psi till redline (ideally, you wont get it perfect but should be able to get it damn close)
has your stock ECU been chipped or is it just a standard computer? i would expect with all those other mods that its at least remapped, if not, then you've really gone off track buying all those other mods and this should be addressed immeadiately, without management all you've done is thrown away your money till this point. what size are your injectors?
1. invest in a fuel pump
2. sort out the boost issue, do you have an electronic controller?
3. get the A:F ratio flat at 12:1 till redline
4. get it tuned properly. i dont know the specifics of your mods and what you told your tuner you wanted done, but it really does seem like a rush job (dare i say it, a poor effort?)
did you ask for a tune or just a power run? if tune, who did it? (this assumes you got remap at least)