+ on the leave it alone concept. But if you do want more, the easiest way is chemicals. Toluene can perk it up a little. No more than a 10% mix. Or if more serious, try some Klotz Nitro additive.
https://www.klotzlube.com/techsheet.asp?ID=85
Tuning is needed for both with higher mixes. Both will clean valves/carbon and carbs. Nitro more so. The nitro can range from adding enough to bring a tired engine back to original HP. To LETS BLOW THE HEADS OFF. I personally kinda like that mode. lol Is important to stir the tanks if you let a mix set.
A little writeup on Nitro power adders.
http://www.racing-fuels.eu/nitro%20power.html