Thanks. I'm glad too. Lovely to have it running pleasantly. Can't wait to give it a good long test ride before I give it back to my dad.
Yeah, I found myself doing exactly that, naturally overshifting a little and shifting back. And you're right, it is going in the direction you say that has this issue - 13 to 14, 14 to 15 etc. The other way is fine if your sensitive to it when shifting.
Might have to take a couple of photos with the old chain for aesthetics! Other than that, maybe I'll try it out again when I hunker down to get the Gran Sport mech and working in the distant future! That's for the old Claud Butler I've been gathering the early Gran Sport and FB parts for years now.