Those look to have fairly severe nute burn.
When you flush all your really doing is trying to stop it from ruining your buds as well as your leaves.
As you can see the leaves have bore the brunt of the burn which is good as your buds aren't burnt.
Those leaves will never get better snip of all the really shitty looking leaves as they are just blocking light now to the good stuff and just keep feeding them as they require it with only molasses and water solution.
The molasses will help to fatten your buds aid in flushing the soil and help to provide enough nitrogen to help them stay greener until the end