Andrew,
FWIW, my Caerphillies always seem to come out with a bit of a "crackled" look on the top and the bottom. Of course, I'm only up to #4, so not exactly a long track record, but it has been quite consistent. The last one I made (this past weekend), I pressed at 60 lbs for a 6.5" diameter mold -- which has been well more than enough, in other cheeses, to get a very good knit. The sides are knit beautifully, but once again, the top and bottom look "crackled." However, the past 3 Caerphillies have had the same look, and yet have had no problems with rind development over the 3-4 weeks that I usually age them. They have been less likely to develop mold than the Lancashires that I often make at the same time, which generally come out perfectly knit on all sides. (I have not been brave enough to allow a wild rind to develop in my cave, so if I get any mold on my natural-rind (i.e., unwaxed) cheeses, I clean them off with vinegar/salt.)
--from another Andrew, though I generally go by Andy