I read you said you feed pretty hard and flush regularly. Do you use something like florakleen or just water and how often do you flush? Also do you run regular hempys or is yours a soiless hydro setup of some sort. Im sure you said somewhere in this journal but the laser page still has me eyes blinded.
I flush regularly atleast weekly, depending on her uptake, i flush more if she's drinking more, but usually once a week, more so when it gets further into flowering. I use Florakleen from general hydro, and i use a 45 litre res which i mix 100ml of florakleen into a fresh tank of clean water, and i run that circulating through the whole system for around 20-30 minutes, then i close my return line of and fill my pots to the brim as far as i can go without spilling over the top, and then i open the return line, and dispose of everything that comes out. Then i replace with fresh water and nutes.
I use 100% perlite it is considered Hydroponics/aeroponics it's a mix of both really. Soil-less completely.
I feed at regular intervals, every 2.5 hours when lights on for 15 minutes at a time. when the lights are off, i feed once at the beginning of dark cycle, and just before lights come back on, every 2.5 hours after that. If temps are really hot i will bump the timer down to feed every 1.5 - 2 hours to keep relative humidity up. perlite dries up fast, but does hold alot of moisture, but never too much. BUT you don't want to let it dry out to much when the lights are on, because that is when salt build up will occur. feeding every 2.5 hours atleast will solve that issue almost completely with good nutrients.
My setup (my pots) 1 sits inside the other, and sits raise above the nutrient level in my res, so gravity can return the feed. If the pots aren't raise above this level, the roots will be submerged in nutrient, and defeats the purpose of using perlite in this way. I also use a good airstone, which i replace every grow, and clean at every flush with boiling water and a toothbrush!! yep i'm a clean freak. when i flush, My res is sparking clean