Thanks for the thread, Andy!
I use flatwound 13s in my archtop and 12s on my ES-type. I played 9s for years (many moons ago in my rock days) and was never quite happy with all my "guitars" ... until I finally realized a couple of years ago it was the strings(!)
So I need to change the 9s in my new Tele too, but I wouldn't like to loose the Telecaster vibe, so what do you gents say? 10s or 11s (while still having the twang)