Leaf discoloration and a couple other questions in general!

Hey guys

A couple questions here, feel free to answer one or all or none lol.

1)I pulled these leafs off the bottom of my gals and while I have some NBurn from mistakes made it doesn’t doesn’t look like this. I do have a fan blowing from underneath my plant, so could this be just from the movement from the fan?

2)Also I think I have one or two more weeks left of flower as I lost track of the week and have been checking for amber and nothing yet but probably 50/50 clear/milky -. I’m thinking one or two more weeks. Thoughts? Or other ways to tell?

3)Flush: how long does it take to flush a 5 gal Bucket hydro plant? I read two days with fresh water, is that true?.... my thought is once I see some amber switch over to water and start to flush for two days and then harvest. Thoughts?

4)Lastly, from a nutrient standpoint I have been following the GH Trio and i LST both plants... at some point if you keep LST’ing and make a sea of green that’s massive wouldn’t you have to up the nutrients? Or does it just absorb more quicker so same nut mix but faster consumption...

Thank you

Also this is my other Plant that’s a couple weeks behind. What’s could be causing this

When you burn a leafs main transpiring zones that are on the outward edges of each finger, on each fan leaf, from way over feeding, the leaf can no longer effectively transpire, so the leaf edges begin to rot, making the edges of each finger, on each fan leaf, roll downward, and inward! If you look at all your pictures you can see that most all the transpiring point on your examples are completely fried! I circled a few to show you what I mean....

Yeah but these were the only leafs like that. They are not all like that so that’s why I think it’s the fan as they are the closest