once you top a sealant (try working on multiple layers for even coverage and maximum shine) with a carnauba, that's it. don't apply additional layers of sealant anymore. maintenance na lang. what you can do is re-apply your carnauba on a regular basis. sealants are durable and should last you for a good 2-3 months. what you are basically doing now is just working on the paint with a layer of sealant underneath.
are you polishing ba with abrasives or just pure polish lang? if ever, if you're only using a IHG-Wax combo, you can do this as often as you like... as long as you're topping IHG (which is just a glaze BTW) with a pure wax.