The Profec B has a gain adjustment.

However, don't expect miracles from it! It won't make a laggy turbo any better.

If I were you, I would go that little bit extra to an Apexi AVC-R. I still don't think its the best controller on the market, but it has alot of functionality and it has a very important feature. It has the ability to adjust duty throughout the rev range. It also has a digital Rev counter, which is very useful!