Last night I installed ReverseDOS and I've not had one referral feedback since. Now, I don't know if any others are being incorrectly blocked...based on my normal trackback pattern (basically none) it will be a while for me to notice.
I've also went through the blog_content tables and manually deleted all of the bogus feedbacks. I think I'm clean at this point...including my wife's blog. Now I'm just going to sit and watch to see if it stays that way and for how long.