It's bittersweet to read this. I feel your pain but hope you can help as well.
I reached out to Askimet and they told me (rather rudely) that my comments were seen as spam by some people and therefore I was blacklisted. They took me off the blacklist and said it could only be done once. At first, I thought things were fixed, but quickly realized this wasn't the case.
On a few blogs, I can comment without issue. On others, my comments go right spam. If I don't include my URL in the website section of the comment, my comments go through close to 100% of the time. Sometimes they are held for moderation, but that is all.
From the time I was "cleared" to the time I noticed my comments weren't showing up again was like a day. I made maybe 5 comments max. Right now, I am at a loss for how to proceed. I get around the issue by simply not putting in my URL. I realize that comment links are mostly worthless in terms of links, but would still like them to make it easier for others to check out my site. Simply clicking on the link to see my site is a lot easier for others than actually typing in the URL themselves.