The oil could be residue in the pipe, but I agree with RadarRacing make sure your carbs are snyced. This is usually the main cause for one side smoking more than the other. As far as your jetting goes, I would change the plugs and do a WOT plug chop. My guess with your mods at sea level would be 27.5 or 30 on your pilots, and 300, 310 on your mains. If the plugs are still black and oily. drop down one size at a time and try again. When the plugs are light brown to tan it's jetted correctly. (black and oily = rich, white=lean, light brown/tan= good)