If what we're looking at in that picture is the rear tire from the rear after 1700 miles of use, then yes that seems like a LOT of lean out.
Your scientific method for gauging tire wear "on the fly" is tried and true. 
However, Shinko's are notorious for fast wear on heavy bikes.
I know Shinko's. I've used them on my K100's. I just wanted to get on the road figuring I would eat up a tire trying to get the rig aligned and sorted.
Thanks,
jim
ck out the Kosmann Racing Web site, it has another company called out that is doing the machining work.
Anyone running a CT on a 2012 Indian Chief? Wheels are 16X3.5" and the rear tire is a 150/80 R16. looking for some options here as I'm having the Chief hacked with a hannigan indian heritage sidecar.
I use Dunlop E3's on my 1082 Goldwing /Watsonian Monaco. Get 10-12000 miles consistently. Used Dunlops the last 30 years and always get good mileage. Doug
