Nothing new, but I boost to 18 then fades to about 15-16psi.
A new Kinugawa (Forge clone) WGA I'm getting will have a 14.7psi spring, which is quite a more then my base stock WGA which is maybe 6-7psi.
I'm just got news from a dude in the UK that if I add a restrictor pill before the boost solenoid that helps hold higher boost. So now I'm on a mission for more info.
Volvos don't use the pill, but Subaru does and I just
happen to "know" a bunch of guys that might have some "handy"...