I too had the same thot, especially after i spent $600 on full tune up just 3 days before the leak started...It is your over flow valve that is leaking and since you gave your carbs a bath in solvent i'm assuming , a piece of debris has probably found its way into the seat and allowing to much fuel to pour in, that was my problem thankfully, however new needles and seats aren't very expensive and since you have no problem taking those carbs off do it again break-um down to the bowl and replace the neccesary parts. hope this helps, good luck!
p.s. i got so tired of dealing with carb tuning problems that i went out and got me an injected BEAST V-MAX!!! much less worries
p.s. i got so tired of dealing with carb tuning problems that i went out and got me an injected BEAST V-MAX!!! much less worries