I run 30, 1st and 2nd gear, 35-36psi on 3-6 on mine. Walbro 450, racingworks mpi, flex fuel sensor. FYI the single walbro cannot support full e85, at least how UM tunes everything. I generally mix e50-e70. According to UM, the boss kits don’t see any real hp gains after e50ish anyway. That’s what I’ve been told, heard from others with similar setups and my local tuner echoes the same. I’m very happy with my setup and have been driving this setup for 9-10 months, trouble free after the initial, what I’d consider normal install gremlins, but since sorted been golden and happy!
I would definitely expect yours to be running less boost than mine though, because of your attitude, l’m close to sea level. Unless you’re built block I’d expect lower psi, which is a shame the Garrets really come alive over 30 psi.