well id take the lid off, or cut a huge hole in it, i run pretty much the same elevation same pipes and filter but a huge hole cut through the lid both layers, 280 mains are great in the spring and summer weather on mine and a bit fatter for winter, with your lid right now though thats restricting alot of airflow if you keep it on you might try some 270 or 260 for the coming warm weather, i run the toomey needle, i run 3rd clip down from blunt end and stock pilot jet, throttle response is very crisp, your pilot must be rich, especially with that airbox and lid setup, put a stock pilot in it, and take the lid off or cut one big hole through the lid is what i like, some of the lid helps keep water out,and try it, u can read the plug chop thread too but some people will also say u can just look at the end of the electrode on the plug color after running it hard it should be a tan color and your main jets are good, gota play with it a bit and see what works, pilot def sounds rich though, and do somethin about the lid or lean it out a bit