Do you let all your paphs get a bit dry before you water them again
No, not at all. The majority of them don't need rest periods, and those are never allowed to dry completely off. In other words, they get watered; they dry to dampness over the next several days to 1 week, and then they get watered again. How long to wait between waterings will totally depend on the seasonal temperature and the potting media, and while the top of the media may look and feel dry, the root zone may still be very damp. Any time you're not sure, check by dipping a Q-tip a few inches down. (Some people use toothpicks for this, but I don't like running the risk of unnecessarily piercing any roots, over and over and over...)