Well Op, you sound as if you'd be a really good governor in a different school. Yes, dump this one. You could have a read of the public minutes from a few other local boards and see if their governance is more effective and you could expect to be able to carry out the role properly. You should be able to see on their websites if they have vacancies.
I do a little bit of clerking work, just one school, and some training and consultancy for clerks and governing boards. I'm a very experienced clerk, don't need to do it at all now, but find it quite interesting and want to carry on making some sort of contribution. Reading through this post confirms for me that MN is a really bad place to come to find out about the role of school governors. Just a few examples:
An increasing number of Clerks are self employed. Usually a financial decision.
Governors don't always work through committees. A lot of schools now operate the Circle Model of Governance, which can be really effective if the governors are committed.
Parent governors have exactly the same role on the board as any other governor. They can be on pay committees, disciplinary committees, the lot. If they are tainted by prior knowledge they would declare themselves unable to serve on a specific committee like a complaints committee, but that's the same for everyone.
Chairs of governors are 'first among equals'. Their job is to support the head, plan and approve agendas and make sure meetings run well. Unless specifically delegated, they have no authority to make decisions away from board meetings.
Governors can use their skills and knowledge to support the school in a non-strategic way, but their role should be clear. Teaching classes, advising on areas such as the curriculum - no. Very different to a governor taking an assembly on Internet safety, or bringing in their dog for children to meet.
A governing board dominated by staff, or parents, is a badly balanced board. I'm not going to quote it, but the boards have to follow regulations about their constitution, reflected in their Instrument. The numbers are there for a reason. A lot of schools make the mistake of co-opting too many staff or parents to their boards, it's lazy recruitment. They also co-opt staff just because their job requires them to attend meetings - people like finance managers and deputy heads. It's not necessary and really bad practice.