I'm assuming you've tried this, but have you thought about beers after work with these people, individually, and having a frank discussion about what you're percieving? I'm not saying it'll help. Heck, sometimes it hurts. But the other two are nukes in comparison to the fallout from a simple discussion.

At the end of those discussions, you may just find out it's a "shaddup and be the code monkey" type of situation. Make your decision from that. I'd still prep the resume though. In the end, laws and retaliation suits and what not aside, you will need to work. If you're not going to become a doormat (which from your description is what you're being treated as), you're going to need that paperwork in the near future just so you have a fallback plan in case things fall through.

Also, a private discussion, no paper (yet) with the VP might be called for, just so they're not surprised when things start hitting the fan. Small firms are like families, I've found, and there's forms of pressure and discussion used that have nothing to do with HR, paperwork, or anything else found in legal documents. Sometimes a respected family member just needs to Gibbs-smack the annoying uncle so he realizes he's being a pr**k.