Possible stage 2+ issues?

Hi, your advice would be very appreciated

I have a a4 DTM, my mods are
-autotech hpfp internals
-awe fmic
-3" test pipe
-d version dv valve
-bmc panel filter
-mrc stage 2+ remap 275bhp & 305ft/lb torque

my issue is my car doesn't pull that well considering it has 305ft/lb i cant see any boost leaks and i cant remember if its always been like that as I haven't had it mapped that long. when i got mapped it had issues with the fuelling mrc said the pressure kept jumping at high rpm so the turned it down, i logged the fuel rail pressure at 125ish bar is this normal also it is at 125bar even at half throttle and sometimes it seems to pull smoother at half throttle!
I will talk to mrc when i have some ££s as i know there good guys who will help, just wanted to see what you guys think.
Another thing my friend has an s3 1.8t stage 1 260bhp & 280ft/lb and he pulls away which is a little disheartening as iv spent alot more money on tuning and i have more power im about 100kg more in weight.
for any other stage 2+'s I did a 4th gear pull and it takes 6 seconds to get from 60-100 is this about right?
i have a ross tech diagnostics so if you know any logs i can do to check anything let me know, also no fault codes showing.
All advice will be appreciated.
Thanks in advance

Nick

Just to add i have a very quiet rattle on very low rpm, just searching and it may be a wastegate rattling issue could this affect the perfomance?