Steve,
I have no idea how crudded up my carbs may have been when you did them last year, but I did not send them to you because they needed work, I just wanted the performance improvement (and got it).
I did have some problems after I'd had the bike about a year, but I'm going to blame that on the PO; he'd ridden the bike 10,000 miles in 5 years.
My routing was that in early November, I would carry a small bottle of Sta-Bil, and I would put some in every tankful. Since I never knew when my last ride was coming, I wanted it to he all the way through the fuel system. If bad weather caught me with a less-than-full tank, I would add more Sta-Bil at home, and use the mower/tractor fuel carrier to fill it up.
I never noticed a difference, either when I started using Sta-Bil, or when I stopped.
Jorge