Had my heap on the dyno yesterday, was rich as hell (afr high 10's low 11's) - proof 510's and an evo afm don't cancel each other out when used with an ecu expecting 450's.
Tweaked it as best we could with the old school s-afc (afr ~12.5) and it made 189kW with boost spiking to 18psi then dropping back to 15psi by redline. This dyno reads about 10% down on the one the cars previously been on, so by just adding reground cams, tweaking the fueling very roughly and 1psi more boost in the midrange and 1psi less up top it's making 30+kW more than before. Couldn't add any more boost as it would start to knock when it spiked any higher.
There's a whole lot of my current setup that is less than ideal (stock wastegate is just wired shut until I cbf to fit the welded exhaust housing I have, stock j-spec intercooler and teeny tiny piping, bleed valve to raise boost, rudimentry fuel control, no ignition adjustment, 1 manifold stud gone awol), so there's certainly more in there.
Will post the graph's when I get home.