Awesome to hear about your 6-inch babies!!!
I had good success doing what Michele once said ... moving them, at that 6-inch size - as they are ready for their own gallon pots (hence my visit to home depot - $1 each). Doing that has meant I went from 2-3 years waiting on first bloom, to blooming the next year or so.
I'm having the same thoughts about SDC - there are so many others that have, right out of the box, been what I'm looking for. Now, I just gotta get them dug and sorted, and take the next step making room for those that work better within my goals. Hard to do, but oh such a good clean start.