This does not sound promising! Damn spellcheck!
Your room is looking great. I wonder if some gypsum or dolomite in your mix might not help with PH issues. Worth a thought next run. The other thing i would add is a good quality compost from a sand and soil yard. I believe Shanti recommends this or the equivalent soil mix these yards sell. This would also help with PH buffering and lessen the need to feed with water. Also some seaweed meal mixed into your soil mix could help keep things happy down therebut that may already be in your fertilizer mix. If it was me I would topdress with some compost or worm castings and stop fertilizing, if you are. Give them either straight water or water with seaweed diluted in it and let the topdressing gently feed them. I don't need to PH with this method either. Peace man✌