"I think I get Cyno because I probably get lazy and don't change my RO filters enough?"

That's one thing that can really have an affect on your water parameters. If the TDS coming out of your RO unit gets too high then you are getting behind before you ever even start your water change. Replacing the cartridges on your RO unit are the only way you can ensure it's performing well enough to warrant what you paid for the thing.