Remember no more than 5% on the fuel. I also would suggest you turn the silencer so the pressure tap is on the bottom, that will help keep oil from accumulating and running back toward the port(actually had that happed to me on a ST 51).
Bet your low end is in need of a little help and don't totally peak the high end or it will also create a lean condition. Back off several clicks on the high end until you get the hang of this engine.
These engines get much better the more they are ran........