I am from South Africa where these plants come from.
To prevent curly leaves, D Capensis need bright light. The plants in your photos are very green, no red pigment. Give more light without the heat and you will have healthier plants. Take a look at this
photo of one of my pots with a few plants in it. Yor plants do not need to be as red (unless you have alba variant), but should display some red coloring.
Flowering four times in row will drain a lot of energy. With D Capensis as most CP's, they need good light to be healthy. Feeding bugs is not as important, they can survive with out it. As for feeding, I feed my plants bloodworm without mashing etc. As long as it is not in a terrarium it is fine otherwise mould may grow on the worm.