I'd start with Tom's comment. Your discus needs clean water above all and changing a lot of water is the best approach for every discus keeper.
It's hard to comment on your water quality specifically because the numbers do not make sense. You're showing very low GH and KH, so what is keeping your pH so high? Low GH and KH means there's very little dissolved ions in the water to do this and pH does not stay up by itself. My recommendation is that you take water samples, both straight from the tap and out of your tank after 24 hours, to the LFS and ask them to test for you. They run tests constantly so their reagents are usually fresher, thereby more accurate.
As for changing your water, my advice is DON'T. Water chemistry is incredibly complicated. The reagents that promise a drop of this acid and a teaspoon of that buffer do not work. Unstable water conditions is far more stressful to your discus than suboptimal, but clean, water. In fact, unstable water conditions will eventually kill any fish.
I recommend you get healthy, high quality discus from Simply Discus sponsors (I don't get money for saying this), put them into your tank and change water. You'll have at least a year of enjoying raising discus before worrying about breeding.