Tetsu:
What did you end up using? Your Mexican Garcinia seedlings? I hear you about the size. I notice the Mex Garcinia is bigger over all, and you would need a bigger rootstock of similar garcinia. I don't want to gamble with my Mex garcinia rootstock, because they are so slow growing, and I already lost a big one during transplant shock. I have two garcinia pedunculata, which are bigger naturally. I wonder if they would work. My achacha is narrow like you mentioned.
gunnar: sending you a pm.
vernmented: If anyone has grafted it all, it's probably Raul.