[eff]

Bog of bottom like that suggests a lean pilot circuit. The confusing thing is that you seem to have a float needle issue which should make it rich. I assume you know your jetting is good for the cooler temps we are having now so I would focus on your float/needle setting.

If you have not been doing anything to treat the ethanol in the gas then that may be the issue with your float needle. I would pull the carb and check your float height and look at the needle. If in doubt just replace it.