Hi,
I've been told that most common variety here, Fino de Jete, shows some problems of incompatibility with other cvs. I can't tell much from my experience, aside from that Pierce seems to take better than El Bumpo on Fino de Jete, grafting same day and in the same way (whip and tongue). Have you observed same issues with this cv or others? Maybe Pierce or Cumbe or any other works better than Fino de Jete as interstock/rootstock in your experience.
Thanks