Red Sugar Auto

DAY 43 The plant keeps on growing well and is stretching, growing about 10-12 cm per week. The fan leaves below are still drying out (the first three sets are affected), but it doesn't affect the growth and/or bud forming so I'll just leave them as they are. If someone is reading me and had the same issue or knows what is wrong, please let me know in comments. I'll appreciate it a lot! Watered the plant with 1.5 liter of water PHed to 6.1 with BB, BTI, and Flawless Finish by Advanced Nutrients (I use it as a magnesium+sulfur solution for deficiencies). DAY 45 Wow, that was quick. Grew like 10 cm in just two days and I had to lower the plant. Hopefully the stretch will finish soon. Drying of the lower fan leaves slowered down a lot and I don't think it'll be a problem anymore. It was probably due to underwatering. Started smelling a lot more, but still normal. DAY 46 Watered it with 2.5 liters of water PHed to 6.6 with nutes. Plucked off one set of dry leaves at the bottom and a couple of smaller leaves from the side colas also fell off, yellowing. Now I'm almost sure that's because of underwatering/lack of n. Measured the runoff PH and it was 6.2. Will be watering with a bit higher level of PH, something around 6.5 to 6.7. DAY 49 She's still growing, but the stretch is coming to an end and the buds are starting to fatten bit by bit. I will change the second lamp to 2700k tonight. The lower leaves are still drying out/falling off and that's why I bought a LED strip and installed it down there. Maybe it helps, maybe not. At least won't have that much larf bud. May defoliate her soon.