5th grow: ChemPie and Laughing Buddha

First day of week 8. The ladies stretched quite a bit and seem pretty okay despite their pale appearance. Seems like we officially arrived at the flowering stage. Somehow i seem always to get problems roght at the transition to flower and i can't get my head around what goes wrong. Environment: Temps between 26 and 27° during daytime, 20° at night. RH between 55 and 70%, Soil PH is 6.5. I feed at around 600-800 ppm, they show signs of nutrient burn anyway so it should be too high. Watering every two days with PHd solution at 6.5-6.8PH, just water when dry. But well, i try to do my best to keep them alive and happy. But i'm totally open for tips!