ok , I was just going on car makers use small turbos normally so they get boost very low in the rpm but run out of air high in the rev range, then boost starts dropping, but only a small amount ,
but T5 and R,s must have a good size,
what boost do other people get on tuned R,s,
about boost gauge , like I say get a cheap one plumb it in just for testing, Then remove it,
when you have the car working well,

Boost leak , you say No leaks at the cooling side, Do you mean The Intercooler,
Dave