I have the same problem, I ended up using a half link so that the wheel moves back slighlty more, although I asked for the chainstay lengthy which matches up with a 22-15 ration not 22-16, there is not much in it but I am going to change the rear from 16-15, I ran my wheel right at the end of the drop outs for a while which also worked good, and from seeing the marks on your drop outs, did you do the same?