i grafted branca on a sabara small leaf rootstock 13 months ago, kept it in full sun and now it is 60x60 cm...grows much better than the original branca of 6 years old, i think it will be larger than the original tree next year.
But this week i grafted another branca on the same tree, hopefully i get more fruit that way.
I have many more small sabara's but they didn't grow at all since last 13 months when i bought them.