aren't the shanes a little narrower? that may be why the larger ones are more comfortable to you. either way...all about personal comfort and choice. good luck!
i have a 10-10.5 shoe and have had 2 watsons. First I bought a 10-11 and i thought they were way to big so i soled them and bought a 9-10. At first the 9=10 was tight but after breaking them in they're great
Dont go big, if you are worried about the coin, buy 07 I'm an 11 in a 11-12 and they are a little sloppy, just heat treated, so will know next week if it helps