First off, great looking tank and obviously you are doing a great job with it.
I have also run skimmerless with very minimal water changes for over a year and kept SPS alive and "beginner" corals thriving.
However, I don't comprehend how you can be dosing 2 part (or 3 part), calcium chloride, sodium bicarbonate, and magnesium chloride or sulfate in sufficent levels to support that coral population, not do any water changes, and NOT be driving your sodium chloride levels to harmful concentrations.
How is this possible? I'm not aware of biotic or abiotic means to remove sodium chloride? I thought the only way to remove it is by water changes.