Anytime I'm having problems with my tank I go back to basics and start over.
If it was me I'd stop dosing vodka and everything and start over. Test like crazy until you find out how much your tank needs to be dosed. Do you have sps or clams? If your tank isn't hard coral heavy you may not need to be dosing much, especially using RSCP salt which is high in alk and cal anyway. Any reason you started dosing vodka to begin with?
Sounds like a plan. No sps or clams. I find if i don't dose my readings will drop. Started vodka to get nitrates down from 15 to 2


