With mineral nutes in soil, best move is to stop feeding 10–14 days before chop and run plain pH’d water (6.0–6.5) till harvest. You’re flushing out excess salts so your buds don’t taste harsh or chemical. Flushing just a day before won’t cut it, plants need time to burn through what’s stored.
Your setup looks dialed, just ease off the nutes, let 'em fade nice and slow. You’ll get smoother smoke, better ash, and full flavor. Let the plant finish clean.