Stop flushing out all your nutes bro, i think its getting to much water but is not the big issue. Do ya have perlite in your soil you may have a bunch of water an soil mixed down in there so its like a mucky mess so the roots d not have air. Can you pull them out and look at the roots, do this after they are dry so the root ball doesnt fall apart from the soil. If its like all wet and mucky i would re pot with perlite added.

Good luck man,

LSY