dude...

dont buy a upercharger!!.. it is a fact they make the engine run leaner, the mid tank lean plus a supercharge will fry ANY .16 engine, i know ive had plenty, also a super charger is not good for some one who does not fuly understand the main features of tuning,
i would stay well clear..

as rct mentioned a higher % nitro, but get nothing with over 8% oil, this will give you a false reading as the oil will submit and show a trail of smoke even when lean, 8% and above is a waste, i would go 25% but a cooler plug, also back to factory settings and start a fresh with running the engine in with new fuel..

hope this helps!!..