My 06' Ss does it when down shifting/rev matching withing the first 10 minutes of riding. I have the breather reroute, "white wire" mod via ecmspy, have reset my TPS and AFV etc.
When I first got my bike used, idle was set at around 1300 rpm or so, when I did my first TPS reset it came out to about 900 rpm 4.6 deg / 5.1% and I just left it there.
A 12-16 ounces can of octane booster will only raise octane 2-3 *points*, I.e. from 92 to 92.3. It's not going to make any difference, but if it did, you would need to retune to see any power difference. Gasoline octane isn't nitrous oxide...