I think you might want to sit near those rubs early & catch him coming out of his bedding area. I've read that usually they mark them in a row on the same side of the tree, which indicates what direction he's heading to. Supposedly, they mark of the trees as theyr'e heading to bed down. A few yrs ago, I had one that marked 9 trees in a straight row of pines, right into a non-hunting zone. He'd been spotted several times, but as far as I know, no one got him. Can you put out a trail camera near there? I've hunted rubs before w/success. But it has to be early. I think you have a good shot, w/as many hoof marks as you say. Especially, if they're fresh. Keep us posted as to who is doing that.