there's someone on FB, in some of the groups like Tx rare fruit growers, and she doesn't use the forum, but she's doing some experiments with ross grafting, and other pouterias, so far looking good for a few species i thought didn't have a chance...like abiu on cansitel? and a few others i forget...
i think Felipe showed me pics of mamey grafted on canistel growing very well, i always thought that combination was a dead end....