Look, it's okay.  In the GA process, the reviewer is king.  I've done about 40 GA reviews myself, and while most went smoothly, a couple of times the nominator ended up furious with me.  Going to GA was your idea in the first place, so I'd say stick with it, work out a series of cuts with the reviewer that you both can tolerate, and get the green star (or whatever that thingamajig is).