interesting you say that. I noticed a serious drop in clone success too for a while. It has went back up some but still not @ the 95%+ I was seeing. closer to 70-80% success. Which still isn't too shabby but still.....
I do know that root riot changed the process by which they make their plugs.
Clonex used to be made in Australia, now it might be Michigan. The bad bottle/new formula that I had was kinda runny and was almost a pink color instead of a purple gel. Either way Dip-N-grow is legit and they've never changed their formula. You can also mix up different concentrations to root everything from soft tissue to hard wood cuttings.
What scares me about a cloning solution with a 70-80% success rate is that I don't have the space or plant count to take 4 cuttings of each strain to ensure that I NEVER lose a strain accidentally. It wouldn't be a big deal if I kept mothers but I stopped doing that and I need to be able to count on a 100% success rate which is what I used to have with Clonex. D-n-G gives me better roots anyways so I'm glad I made the switch.
Anyways, when I used good bottles of Clonex, I noticed roots a couple days quicker when using KLN. I'll reintroduce KLN when my cloning is back up to 100% as I've only used Dip-n-Grow for like 6 months.