I have a 2018 Kestrel Talon X Ultegra with a PF 30 BB shell and currently a Praxis Works PF30 to GXP BB with Oval 300 cranks (in GXP obviously). The Praxis BB has around 10mm of threaded space outside the BB shell (i.e. the inside of the crank arm at the bolt is 10-11 mm away from the carbon shell of the bike). I'm asking because I'm looking to get a Quarq PM and I would like to ditch the conversion BB and get an actual PF30 BB and a DZero in BB30, not GXP. Or, alternatively, a Wheels Mfg PF30 to Shimano BB with R8000 cranks (PM location TBD if I do that).

Do PF30 / BB30 BB run flush with the carbon shell or do they press out as well, like my Praxis?

Praxis BB pushes 10 mm or so out from the shell, roughly 7 mm of clearance between brake and crank arm