Ok Kenny, I'll tell you what I think and you can choice
First is that some strains can be notorious to being sensitive to over feeding, so looking at the brunt tips I question that, has the tip burn been around a bit? It will not go away but should not get worse.
Not all brown edges are a excess.
Second is what I really what to say. Your plants need to have the nutes raised. Lower yellowing leaf is a sign that you have a deficiency. Plus been in the ffof for six weeks leads me to think your Indica plants are hungry. If you feel like this is matching info then look at 2 to 3 tsp. Of Big bloom, or tsp. Of grow big and 1 tsp. Of tiger bloom the next feeding.
Then make sure you flush with a good amount of water at 6.2 Ph to get 20% runoff.
Third is that the sulfur smell can be caused by not letting your pots dry out completely, they should be super light when you pick them up. Your droopy leafs can be from this as well, overwatering is a big problem multiple ways, 1) too much too often or 2) watering too soon. If you are having a waterlogged root problem that can cause lockout. Judging by the size different this could be a problem if you water them all the same at the same time.
I sorry that I'm not more definite with my advice, I just see it could be either way from the pictures.
Hope this helps and don't change the other plants they look great.