Had to come back to post an update -- even though I made a lot of mistakes, 3 of my 6 bulbs have bloomed, another is about to do so (and will have 2 bloom stalks, the others only had one each), and one of the 2 that didn't bloom (yet) was the one that bloomed in the middle of the summer, out in the GH. The other one that doesn't look like it's going to bloom any time soon has a very small leaf poking up off to the side, so apparently the bulb is dividing?
(maybe this year I can get the timing for letting them dry out and such a little closer to right!)