eMAP is not bad at all! @Predator1
What are your AFRs like? Also do you have EGTs by any chance? Let's say theoretically a few injectors are running a bit lean, your overall combined average AFR would be lean, naturally a tuner would dump in more fuel to make the average overall number look safe again.
Now because of that, you're dumping in much more fuel than needed and overall making a little bit less power than expected.
Not saying that it's the case, but good to rule out one more thing. Lastly, just to rule it out, just dump your wastegate to atmosphere for a dyno pull and see if you make heaps more power.
What are other cars with the same-ish setup making?