What boost pressure did you get with it set at 52? If your going to reset it set the gain back to 0, or a low level. For example if you want to set it up to hit 0.8 bar : Set the boost to say 58 (assuming this is 0.8 bar), when you see on your boost gauge that you are getting a steady 0.8 bar of boost, at the top end of the rev range and it isn't creeping you can then adjust the gain. Adjust the gain in small increments, say 5 points at a time, this will bring on the boost faster and stronger. When the gain is set too high the boost will creep past your set target ie 0.8 bar, this is when you should back off the gain a little.