I'm starting to think I'm going to do a fast poster pass and then a manual comment pass. Manual commenting with with thebestspinner open. Just spin, then copy/paste, repeat. That will probably be faster than slow poster. Slow poster has been killing me as well. Too slow for such a little success rate.
It will be faster, I think... but that REALLY sounds like work to me! I've tried doing that and for me, it gets old really fast!
Now, if you've got a nice list of auto approve high PR blogs to comment on, I'm with ya!