Hey Crimson...
For my transplanting I like to grow in little seedling pots until they REALLY fill it up, then one transplant to their finishing pot. Right now I have my clones in 1 Liter airpots, pretty small, in a week or two I will transplant my keepers into 15 gallon airpots for finishing of veg/training and then flower. Before when I have started seeds/clones in big pots they really seemed to grow slow at first, so that backs up theory you mentioned. But it was also too dam hot the whole time for the new seedlings in summer. So not a very controlled test.