Going Lean #1

I read this post on romraider where someone was trying to go lean in closed loop so as to have better fuel economy.

Basically the idea is to set "Closed Loop Fueling Target":


And increase my timing slightly:


After flashing, my logs showed no knock but my boost climbs much slower now. :-( Throttle response is not that great either. I'm going to flash my original timing and see if I get any knock.