The 110/115 likes to be as lean as you can get it on the bottom. I too had some airflow issues and have tried the bme carb cover with vent line in the fuse, 3w 90 degree intake, and neither really helped. I tried last a rc blimp carbon carb cover and all my problems went away, so who knows. When you first start the engine first of the day, if it will transition right after start, it is too rich. It shouldnt take any throttle for the first 30 seconds or so, and after that it should transition perfectly. If you get it to that point, you are about on the low end. Like SS said, if you tweak on the low end and crank it in, make sure to open the high end a smidge.