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As you are not planning to app for anything, you can let your cards report. The balances only affect your scores in that moment, utilization has no memory. Just make sure to follow the above mentioned rule about a month before you plan to app to give the cards time to update to the CRAs.
But with that said, your cards will still report a positive payment history even if they are not reporting a balance. So just use them as you normally would and pay them on time. The rest will fall into place.