I just cut my first two seedlings that were germinated in Dec., 2013. One was over 5" tall and the other right at 6' tall. Both were single-stem. Both cuttings are about 24" long and the stems are about 1.5" in diameter. I will root those two cuttings in a few days. Needless to say, mine haven't bloomed either. Hetty said it takes approximately 3 years for a seedling to bloom and she has perhaps grown hundreds. She would be the one to tell you what's going on. My Slaughter Pink plants bloom every year so its not like they are shy-bloomers.
That is amazing to have 97 seeds out of 100 germinate. Where in the world do you put those 97 seedlings?