The concrete question you asked may never be answered. From what I am hearing, it is proprietary to Lariplast, their secret sauce if you will. It is under 1% from what I hear but any number after that is anyone's guess.
As for the price dropping, dissappointing but with no follow up news, not shocking. However, we have seen in the last week that ZEN can move up fast and with the right news, good luck buying in size.
I have a feeling the new VP of IR is just getting ready for a busy season this fall. For the first time in a while, I believe our time is now.
G.