The Blue Jaboticaba trees (in 25 gal pots) were not watered quite enough. I missed the chance to water them during critical dry periods, and should have put them in a dish (kiddie pool) as I've done in the past...I really think this tree benefits from sitting in the water for short periods, especially while fruit is on the tree...you simply can't water them enough.
It just takes the right grower, with the right attitude, and these can really make some large delicious fruits. Here is the largest one my tree has made so far, although it had an unusually high amount of seeds, the fruit still offered enough edible portion to satisfy me. The texture and taste is so much different than any other Myrciaria I can think of...I always am reminded of rollinia pulp, mixed with jaboticaba pulp (surrounded by a key lime / pitanga, tasting skin, at first I detested this flavor aspect, but learned to enjoy in moderation....and how to avoid it almost entirely, using a knife to cut the fruits in half, prior to consumption)
I will be sure to post when I've got some larger ones. I know I can get them even bigger.