Here is what I'd do if I was you. Your got a problem on your hands and might be compounding the problem to soaring heights. First stop using those pills, I know their cheap and would seem to be a quick fix but they adjust ph with salts, and with adding salts with the pills and some salts with nutes your causing a lockout. With flushing you should have helped remedy this but only if you don't use those pills. So, I'd forget using any nutes and just use plain water. If you can measure and adjust you ph then your out of luck either way. Cross you fingers and hope for the best, do what you can and dont worry about what you can't fix. If you knew wether your water was high or low would help then at least you could guesstimate. Hope things get better. Ill be keeping an eye on it.