Decided it's about time to update this thread. Just put the car on the dyno for a long 6hr session with Chris at Motiv and we were able to put down a heft 526 to the wheels on E30!
Running maffless was causing us a lot of issues both on the dyno, and the street. The car was pulling timing on higher boost runs on E30, and was dying after startup. I went and purchased a 3.5 inch MAF housing to use with the speedtech inlet and cone, and it fixed all of those issues. Didn't want to update the thread until that was all figured out for sure.
Will be installing an ethanol sensor, bluetooth analyzer, and -6an fuel line this weekend because ethanol mixture accuracy is a pain!