So the addon seem to sort the items excellently by buyout compared to hist. value %. But, sometimes there's a low bid value, and I can't seem to figure it out to sort it by that? Bid value compared to hist. value.

How can I do this?

You can't. I've been thinking about adding it but haven't yet found a good way to extend the table. Another percentage column might be a bit too much bloat for the table. Some way of switching is an alternative but I already dislike the way switching between unit/stack price works ...

This is the reason I still use Auctioneer as well. Having a complete overview of bid-only deals on a full scan has made me a ton of gold with minimal effort. Hope you're still considering.