JayWalker

Welcome. PM member "skuuter trash". He has lowered a couple VFRs. Hell, I think he lowers all his bikes.

I think the issue started after an additive was used.

And this solved your surging issue?

It's all about confidence. And it sounds like yours is shaken, understandably so. If the tires are bothering you, replace them. You need to have complete confidence in your machine, so you can work on the confidence within. You will get there!