You always need to have the temp on your helix set higher than you want to get the tubs at a good temp! The tubs are always off from each other by a degree or two on each level. The top is the hottest because heat rises. The bottom should be at 89-90 and the top should be no more than 95! It is a bit of a pain to ticker with it but once you get it right on then it should hold it for good!