It is great that the product and strength that you are using is not causing skin irritation. I agree that retin-A works deeper in the dermis and may not necessarily cause skin irritation. I recommend the routine use of these products with an Opti-Ceramide cream and Elevase Moisture Booster is ...
Dark skin is much more sensitive to any skin care treatment and is not forgiving. You should use the be under the care of a dermatologist or plastic surgeon to lessen the chance of complications. You can not treat yourself.
The retin A can help the acne issue but the effect is not instantaneous. Don't give up on it. As for the other product, perhaps you can alternate using them if you are worried about any interaction.