Yellow lower leaves

It could be leftover from watering issues and probably nutrient lockout from the high amounts of feed you've given. I'd not give nutrients for a week, focus on watering correctly and then re-assess. If the yellowing hasn't advanced, you've fixed the issue. The already damaged leaves won't really fix themselves, they'll eventually die off, but I wouldn't take them off yet. If it continues to get worse, try to just continue feeding. When you continue to nutes go with 1ml/l fishmix (or grow), 2ml/l biobloom. If there's lockout causing deficiency no feeding helps because they can't intake any of it before the lockout is fixed. If possible, check the pH going in and out. High pH means too much nutes.