I agree with Ryan, you will have to riched the low speed needle. I read in a Quadra manual a while ago, that the low speed neeedle feeds the mixture until about 1/2 throttle unitl the high speed needle comes into play.

I was out on Tuesday night flying the GP Patty with the Brison 3.2, I was rich, took four flights unitl I got the 3.2 running where I wanted it, a few clicks on the needles until it got there, I also check the spark plug tip color to see to ensure I am not overlean.
good luck - ken