I have a good friend (Jesse Cote) that lives in Caribou, ME. He runs a guide service and does fall hunts over bait. He's running over 30 bait sites and has a very high success rate. I've been twice and will be back. I carried my son for his high school graduation present.....
He has a web site and FaceBook page: Back Woods Guide Service.
I highly recommend him. You'll find no one that works as hard as Jesse to ensure a successful hunt. Kills aren't guaranteed, but you'll be happy.
Here's an article I did on one hunt there.....
Handgun'n Black Bear In Maine I can't get the link to work right, so you'll have to scroll down to the article.