1st your infos says "hydro" but it's coco growing , they are similar but not the same .
So you'r asking what sort of training can you do ? but you already started to LST your girls so why not continuing like that ? You can apply a topping to help for the lst and build a shope , once the tops will be removed then the lower branchs will thive more and higgher so you can build an even canopy , so when the lateral branchs will be tall enough you will be ablle to bend them with a rope or anything else.
Dark green foliage can be due to a Nitrogen excess but in your case I fell like you can't as you've cut the Floragrow so I guess you did it beuse of the Cal mag Plus that may contain Nitrogen , if not then go back to the original GHE feeding char. The dark green colour of the foliage must be coming from you purple light n purple light are well known to induce dark green foliage and to limit the stretch between the nodes so you get shorter plants.
Droopy leaves can be a sign of over/under watering and as your perlite is tuning green due to some algue then I guess that you must over water a bit or at least you've done it in the past , so the droopy leaves can come from that while the edges of the leaves curling up is due to your lack of humidity ( 50% ) when you need a 70% level.
