Ran through a big list today.
Boost leak test, boost fooler was only leak, so I eliminated it. Also it was opening at 17psi or so fully closed.
Borescoped the hot side of the intercooler to make sure nothing was in there, and it looked good.
Head gasket appears to be leaking oil on the ds side, so that's not great.
Adjusted the hp wastegate six turns in and moved its reference to the intermediate charge pipe. Also moved the lp turbo boost gauge reference to the top of the intermediate charge pipe to see what the pressure drop in that pipe was.
Changed the lp turbo drain gasket as it was leaking pretty good.
Added a stainless gasket between the hp turbo turbine housing and the hot pipe flange.
With all that, went for another rip and got this screenshot. Not apples to apples as the last pull, as this was only about 3000rpm, but it does not appear to have a big pressure drop in the intermediate charge pipe.
With this data, I think the next step is to move to larger injectors, then re-evaluate, but as always, open to other suggestions. Not much else to check/change at this point without injectors though.