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You can wax as much as you want. Just make sure you are using a good quality microfiber with as much waxing as you are doing. You will end up getting a lot of swirls with it being a black car.
Detailer sprays or quick detailers work great for in-between waxes! You shouldn't have to wax once a week. Get a good quick detailer. I use NXT Quick Detailer from Meguiar's!