Excuse the long story, so i'll try and keep it quick and to the point, i have tried googling first but to hard to pinpoint.
My boost is set to 18psi for high boost, 13psi low boost, although when driving it only hits 15psi most of the time. I went for a drive down a private road and it was making 18psi again ( which it hardly ever does this even though it is suppose to). Went driving around that road again later and still constantly maxing out at 15psi, with exactly the same driving style. Nothing was touched or changed between drives. The car doesnt feel like its struggling or choking, no flat spot with high boost, it just will hold at 15 psi through all gears.
What should i look for as I'd like to get back the 50+hp i am not making, and this was all setup at a workshop if that changes anything.
setup is RB25, Tial 44mm external gate with 1 bar spring, greddy profecb 2, gt3040, wolf v500.