Hi
I know it's been a while since you posted this, so not sure if it's still relevant, but if it is, I've helped with a lot of similar negotiations and happy to hop on a call.
Prior to the call, please send me the basic information so I Can review and thus make our time more efficient.
Good luck!

*** I am a mentor on Startups.com, an international lecturer on entrepreneurship and negotiations, a commercial startup lawyer and a leadership coach. I've successfully helped over 400 entrepreneurs, startups and businesses and I would be happy to help you. When scheduling a call, please send me some background information and the 2 main questions you want answered so that I can prepare in advance (to give you maximum value for your money). My reviews: https://clarity.fm/assafben-david ***