Was going to say, Heath "you're gonna need some bigger pots". They do grow really fast in the spring/summer weather.
My starts from cuttings (about the size of your biggest seedling) have more than doubled in size since I got them last fall. But you have to take advantage of the warm summer weather to let them grow like crazy. In fact, one of the rooted cuttings I got from Ken is over 4ft. tall now and has already bloomed.