Beginner takes on 4x Sweet Seeds Speed Auto

Due to ongoing pH problems I decided to flush the soil on day 50 with 2l pH adapted water of pH ... drumroll ... 3.5 (phosphorous acid) !!! Hold on tight: 1l drain stayed at roughly 7.4 thru all pots! I finally gave up on adapting the pH within this run. Lesson learned, do not use this soil again... or at least pH adapt / buffer before the grow. Other than that my watering schedule is: D1 water ~1.2l with fertilizer (1400 µS/cm, pH 4.9) D2 nothin D3 water ~1.2l with CalMag + pH adapt only (250 µS/cm, pH 5.0) D4 nothin repeat Drain stays around 0.1l ... 0,2l per watering with 1200 µS/cm and pH 7.4 ... 7.7. So yeah... this soil is heavy on the pH+ side. Will not be able to adapt anymore, One plant does show quite some problems (brown leaf tips, slightly less green on the leafs). All others are doing fine. Won't be long now! Trichromes are fogging up on most buds already.