Heyo, check your diary. Give them more water mate, approx 1L per day. So 3l every 3-4 days is a good amount per plant.
I would always feed 2/3 of the fertilizer, on every feed. This on and off feeding is super imbalance.
Everything else in your diary looks fine to me. Also doublecheck if the spots could be mold, would look like fuzz in different colors, but very rare.
Cut the dead leaves, this is perfect feed for mold and pests.
Happy Growing.