I had one in the ground (about the size of a full 3 gallon plant) it flowered for a year, but never set fruit. I also thought it was a pollination issue, so I bought a second 3 gallon, put it the ground right next to the first one. Year 2 and the 1st one is not a 5-7 gallon plant and makes plenty of fruit, the smaller one has some fruit, but much less. I think you need a 5-7 gallon plant, or at least a 4-5 year old for consistent fruit set.
I just just cut off a successful air layer of the first plant today, it has been flowering/fruiting since spring. It's in a 3 gallon, but will need to grow into it. PM if anyone is interested.