7-14 psi turbo boost when engine compression brake engaged

I have a true Jake brake... compression brake, not a exhaust brake so yes 10-15 psi air going in will increase the braking because the compressed air is released before it can push the piston back down.

A exhaust brake (variable turbo or not) is much like the butterfly in a carb on a gas engine... it restricts the air flow making it harder for the engine to turn over. Sorry 06Fargo, but higher pressure going in is not going to help as the compressed air is not let out before it can push the piston down.