It never fails to fascinate me on here how some people ask for critiques and get screeds of really good input on their website/logo/brochure/business card, and then.... do absolutely nothing to change it, or just pick out a few aspects they 'think' would improve it.
I really find this incredibly interesting. You dont have to lok far to find heaps of threads where its been total consensus of the community saying "your logo sucks" only to find 6 or 12 months down the track, the member is still running with advertising copy that would scre more people off than it would attract.
I guess what Im saying is, you're not alone in getting 'stuck' on a particular concept - its probably more common than not. The difference is that you are actually listening to what people are telling you and doing something about it.