I think you have the handling aspect switched. The hondas out of the box are kinda tippy. Not very wide or low to the ground. The YFZ's handling is great in my opinion.
When I was runnin 19cc domes and advanced timing, I was mixing 2 gallons of pump gas and 3 gallons of race fuel together. Seemed to work out ok for me.
Im running I-RAZR's all the way around. I really like them. Hook up great. Talk to sredish too, he's got some and Im pretty sure he likes his alot too.