I know this is a longshot, but maybe try the H in Hawaii? I recall from my Bottega days, Hawaii was the only US store that carried the smaller Cabat made specially for the Asian market. Also, I've noticed with these boots (as well as my real riding boots) that with use, the shaft sort of softens and settles a bit around the ankles, and the top of the boot hits a bit lower on the leg. But I'm not sure if that happens if the boots are really loose on your leg...I've never had that problem
Good luck!
Thanks!! It's def worth a try. Do you have recommendation of any SA?