pssst, air bubbles don't blow up pots. Damp pots do. Set your kiln sitter for 12 hours, turn on the bottom element to the lowest setting and leave the peeps out. If you are making regular thickness pots then try this candling overnight or at least for a few hours. (don't forget to turn the dial on the sitter back up again before you bisque fire so it doesn't time out)
edit: I just re-read your second post, I missed this bit the first time: "For a smaller kiln I think an hour per each switch is plenty of enough time to warm up and let any extra moisture escape" doesn't matter what size the kiln is the clay still has to go through the same processes, think you are firing too fast also.