Since you ask...I have my Neps growing in a variety of media. I used to do just LFS, occasionally with a little sand/peat and sometimes perlite mixed in. Now I also have been using everything (coir, cypress, orchid mix, etc., etc., etc.) everything but the kitchen sink! And I do mean everything!
From my experience, the real thing concerning Neps to understand is not so much "what media do I use", but what media am I using and how does it affect things?
What I mean by this is, start with reading the standard mixtures recommended for Neps. They are more forgiving than say a Cephalotus or other things, so recommendations will vary some and it is not overly important within reason. (I am sure someone else will tell you it is!) Use what you feel sounds like a good recipe. (I go by how it feels and looks, but that is something you will have to learn by doing.)
Once you plant them up, CAREFULLY, this is where the "how does it affect things?" begins. How often do you water? There is a relationship set up between the media you use, and how much/often you water. Now add to this how much light/heat/humidity you subject your plant to, and you will find that you need to find a subtle balance of all of these variables! By reading the "how to grow" writings/posts/books you will find out the "norm" of what to shoot for. Beyond that, it is up to YOU to determine where you are "off" from the norm (maybe too high of temps, too low of humidity, or not enough light, etc.) and then you have to watch the response of your plants and interpret what it is telling you about its experience of the conditions you are subjecting it to. (Dry leaves, rotting of the roots, etc.)(Oh, or outstanding and fast growth!)
And while others can make guesses at what is causing the problems, figuring it out yourself is the most rewarding, teaches you the most, and will make it better possible for you to figure things out the next time!) It can be confusing, but most of it is just common sense. (And sometimes there is no obvious cause, and the plant just slowly dies for no understandable reason.
) In reality, I know of no experienced grower who hasn't killed a bunch of plants! (Except those who already have ideal growing conditions outdoors, and have very little thinking or work to do to grow them... and even they have their own share of casualties.)
Anyway, dry leaves generally = too little water/too much light/too hot of conditions/ too little humidity... normal "that makes sense" stuff. You get the idea.
So, back to planting mixtures... if you plan on ignoring your plants for weeks at a time, a mix that holds a lot of water (LFS/peat/etc.) might be in order! It is up to you. Like I say, read what is suggested and tailor/pick out the mix to fit your needs.
No one likes to lose plants, but you have to learn and experience, and sometimes it happens.
From the look of it you have 2 or more plants in that pot. Using slightly different mixtures would actually give you an opportunity to find out a bit more of what the plant likes in YOUR conditions.
When separating plants, I often use rooting compound (I have done this forever!) and for me it insures a good rate of success. I also feel it gives them a head start rooting into their new home. I am not a big proponent of superthrive, so you may want to get the opinions of those believing it helps for a more rounded view on it. (I actually feel it is like me using rooting hormone, it helps because we believe it will!)
Don't worry too much, if you find one of your plants not doing as well as the other, you will still have the opportunity to adjust conditions to fill its needs. Just remember, plants take time to talk, and also need time to settle in. Use a LOT of care when transplanting, take your time! Soak the plants in water if it is taking you a long time (Do NOT let roots dry out!)
THEN, ignore them a bit! I mean, be patient! picking at them and constantly changing things will never give them the "stillness" they need to settle in and adjust.
I often contend that it has been a great thing to my CP hobby, that I have other hobbies too! This gives them the quiet time they need, to catch up to my desires to see them big and thriving!
For me, learning what plants are saying is one of the best parts of this hobby.
(Oh, you catching those funky looking pitchers happening is a good call.) As they have experienced a recent change in environment, it is likely their reaction to whatever they went thru. My advice would be to keep an eye on them now and see if they get better or continue to get worse. Continue to get worse means an environment alteration may be needed. Getting better means they had a bump in the road. They will tell you, in time. (Slow to react, slow to speak!)
Again, good luck!