I have a couple from flask that I've been growing for AGES. So much for optimal culture...
I think you are getting close. My biggest one is just a tad smaller than yours. Maybe this year yours will bloom, mine more like next year.
Hangziety!! Funny! I don't think your far off...
I don't know that its common for the specie, I have one that set a bud in the fall, and then stalled until the following spring when it bloomed.