Replaced my post-cat o2 sensors as they were creating slight fuel trim and code issues.
Installed the VRSF 7" HD FMIC, flashed MHD stage 2+ and got her running on E50. Took her out for a quick spin and had a couple of runs with a modded WRX, no contest.
Guess I'm more or less maxed out on stock turbos, still tossing up on whether I should get a custom tune as I have inlets. Already sussing up a long term plan for handling mods, some nice wheels LSD etc before I get too silly with manual conversionand single turbo ideas.