Why are you mixing the coco in?
I'd flush well (two to three times the pot volume) with 6.8 ph water.
Mix per soil applications, not hydro. Big difference in needs.
If feeding daily, you are building-up the nutrient level to toxic levels and dropping the ph. Likely getting a salt build up as well depending on the nutes.
6.3 to 6.8 ph for peat based soil (and peat based soilless) mixes.
I'd back off the additives till they are looking better.