Double xl Watermelon Weddingcake Autoflowering

Currently checking daily and tying away branches/leaves to give the buds more light and watering when the soil is dry. Currently my plants drink exactly 1,5L a day. I have the feeling that the right plant is lacking a bit of potassium. I'll leave everything as it is for now because the left plant (fresh new soil) is growing well. Since the right plant is quite bushy anyway, I'll defoliate it again later and remove any lower shoots. I started adding the Bio PK booster towards the middle of the first week of flowering, 2ml per liter of water; as the pH value drops too much, I correct it upwards with Biobizz pH up - from pH 5.5 to 6.5 for 3L, I add a total of 39 drops. My water is mixed as follows: 3L osmosis water, plus 6ml CalMag, 6ml BioPK 5-8 and 39 drops of pH + BioBizz.