White Widow - My First Grow

Start of the week ============= Still seeing signs of deficiency on the lower new growth leaves. A few imperfections on some of the leaves but nothing I'm worried about at the moment. A plant sharing the space of different strain but same nute schedule is showing similar deficiencies, so just need to fine tune the nutes. Would really like to nail down exactly what this deficiency is this week. Well and truly into flower now and started cranking out those bloom nutes. I didn't mention last week but trying watering with cheap supermarket mineral water to see my tap water is causing any issues. Been having issues bringing down the humidity in the tent, I've had a dehumidifier running in the space around the tent for months, but when trying to reduce the humidity for flower the dehumidifier struggled to even make a dent when it's previously been fine. Bought a new smaller one (these things expensive!) and running them side by side which is helping but nowhere near the 45% humidity I want. Last week I watered with 3L for an appropriate amount of run off after it appeared I may have been under watering and then top up two times with 1L when the top inch of soil felt dryish, then water with 3L and repeat. EG something like 3L, skip a day, 1L, skip a day, 1L, skip a day, skip a day, 3L. But obviously will continue to monitor. Going to continue on that pattern and being a bit more generous with my nute water. End of the week =========== Well scrapped the watering scheduling idea and now just watering when the top inch is dry as every beginners guide mentioned and watering till run off. Thats basically 4L every 2 days. Turned up bloom nutes to 4ml/L as I still think theres a slight nute deficiency. Now I'm actually getting run off, I'm keeping an eye on the PH of the run off and adjusting each water appropriately. So far soil has been consistently too acidic (low ph)