What is the best pH for my soil when planting succulents.
I try to keep my water pH below 6.0
Certified GKH Gardening Expert
That would be considered decently acidic water. I'm afraid that may not be a very good source of water for most succulents. They will prefer a soil pH of 6.5 to 7.5, with around 6.8-7.0 being best.
You may think about bringing the pH of your water up a bit, or since you keep the water acidic, you may have to stop adding what you are adding to do so.
This article will help you with general succulent care: https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/care-for-potted-succulent-plants.htm