Wow Astroman thanks so much for posting those photos. From those photos it looks like they are growing in a little shade then most wild Drosophyllum photos that I have seen, was that the case or just the time of day they were taken?
For me they all seem to grow almost the exact same whether I grow 1 or 5 in a pot....
I think one of the problem is Drosophyllum is not a long lived plant. Not matter what I do they only seem to live for 3-4 years. THe only way that seem to make it through flowering is if I keep them very dry and make sure they have plenty to eat. If for some reason they flower when insects are not readily available I spray the foliage with a seaweed based fertilizer every 3 days.