I think the desire for "middle ground" makes a lot of sense...
People tend to be reactionary (it tends to be a human thing) like when I first realized I liked chocolate _way_ too much and it was making me fat so I spent the next year on the verge of being anorexic. Anytime we get the inclination that one direction or one thing may be erroneous, it is hard to not try and make up for it with the other extreme (this human quality is my personal explanation from how our country went from a Bush Administration to an Obama Administation).
I too grew up uber-fundamentalist... and here's the thing, part of me will always be that way. I cannot change any of my faith experiences, I can only add to them. But then, for a time, I was also super-Liberal to make up for it and so now there's a part of me that kinda leans that way. But then one day I just kinda woke up and realized that I wasn't being me, just the same as when I was trying to be the good radical fundie, I really didn't feel like me either. So I tried on just about every label and denomination to find me and it didn't really work out. So lately, I've just been realizing that I just need to be silent before God, as I am, with my experiences and my views that don't always conform to any label [this is, I suppose, why the UCC's emphasis on unity and allowance of diversity in individuals and congregations is why I can call the UCC home].
I don't know if this is the same as what you experience... but I do know that this whole fundamentalist/liberal dichotomy sucks.
