Chalky, you are a bit impatient
You posted at 1am at our time, you have to take into consideration time difference and stuff. Plus not everyone has experience with Capensis or crock.
I myself am not so sucessful with Capensis, there is a chance that they are sort of like intermediate nepenthes, that they want a bit of cold nights, but that is just my opinion.
The only other comment I can give with crock is that some people say that they harbor bacteria and diseases that might not be good for the plants. I guess if you want to make the potting mix more drainy, why not try Vermiculite or Perlite?
TTFN
Arvin