Hi Joe,
The only trick that I've found to work is to just plant hoards of bananas, and maybe one or two will bloom at the right time
! Of course, my fruiters don't stay in the ground either. I also like to have the biggest corm possible, so I haven't been separating any pups recently. Makes it a bit more difficult to dig and store, but the rewards are great. A trick that I've heard of, and that I may try this Spring, is to spray gibberellic acid on plants that are close to blooming. Supposedly gibberellin stimulates plants to bloom early. I also may try some bloom booster fertilizer on a couple of plants. If all of that fails, I plan on yelling and screaming at my plants to hurry up and bloom!