I got some ammonia and chlorine safe but the ammonia still testes high after I use it.
I'll bet that your ammonia test kit is "hitting" on the chloramine in your tap water and not actual ammonia. Chloramine is one of the most commonly used water treatments and is an ammonia derivative. You should be able to look up your local water authority on the web and get the most up to date readings for your area as well as what chemical(s) they are treating with.
You can keep using RO. I would just recommend using it mixed in a ratio with your tap water that gets you the water parameters you are looking for.