There are other guys besides Xu's line in NY but I dont have a link to them rite now. But yeah there was one of Xu's guys cant remember his name exact, but he called his school Heart and Mind something or other. Its in downtown Manhattan and its a combination Wing Chun and XYLH school. And no its not Yang Fukui's school. Its an African American gentleman. Best to give George Xu a call and Im sure hed connect you with the guy. Good luck. Cheer.
PS: Matter of fact found him for you, here he is-
http://www.sixharmony.com