I was thinking .... you measure your boost pressure at the inlet manifold, and it's say 12 psi with the stock cooler and stock turbo.
If the stock cooler has a pressure drop across it of around 6psi, this would be equivalent to your turbo pushing out around 18psi?
Then ... you upgrade your stock cooler to a nice FMIC with a pressure drop of say 2psi.
Could you then set your boost to run at 16psi (measured at the inlet manifold)??
The turbo would be running just as hard as before, but with a smaller pressure drop.