Sup Cannademik?
I'd recommend not starting them out in the solo cups, I would find a respectable container for the clones to start out in, they grow much faster than seeds, and will over take a tiny solo cup pretty quick imo. I start mine in half gallon containers myself.
With the yellowing leaves and wilting, (without pics) makes me wonder if your deciding to leave too many leaves up top? I usually just leave the 3-5 top leaves depending on size, if too much leaf mass is left on a clone it can overwhelm and cause the cutting extreme stress and/or kill it. The plant can only handle a certain amount of photosynthesizing while it is attempting to grow new roots.
It is a good idea to pull/cut any leaves off the cutting that is to be taken 8-12hrs beforehand, this allows the plant itself to respond to the defoliation, rather than just the clone itself after Is taken (Lowered stress = faster rebound/recovery).
Lastly, take your cuts 1 hour after lights out, let the plant go into sleep mode before taking your cuts from it, I usually wait 15mins extra on top of that hour, I've had good success keeping clones standing straight up the entire time and grow roots faster this way, I notice growth on the tops of my plants within 5 days with this method in soil, works great.
I don't grow in coco personally, but I did want to offer advice where I could, take care friend/s.