I'd check the initial timing, the idle speed, and the mixture screws as mentionned. Not sure where you are interms of rods, but if youcan get the same full throttle (3rd step on the rod) size with a slightly smaller 2nd step, that might help too.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.