Not much info on the BUSA site. The model should not weigh more than 5-1/2 lbs. Make sure you check the C.G. with the tank empty. 25% to 27% back from the leading edge would be a ballpark balance point on the wing for most models. The throws should probably be about 1" for the rudder to each side and 3/4" for the elevator each direction. You really should contact BalsaUSA for the true numbers if you don't get an answer here from a kit owner.

When you say it "does not fly good" what do you mean? It will never fly as good as a model with ailerons.