1. The instructions did call for high strength (red) thread locking compound on the studs.
2. I'll check the witness marks every 2 hours for a bit, then every oil change. If they move at all, I'll probably at an warping/interference nut on the inside.
When I talked to Richard today about the outer nuts, he recommended thread lock on those as well. I'll likely just use split lock washers if the outer witness marks move. Inside and outside marks are easy to check now. Not to mention there is room to remove the three point arms to hook up the B75 backhoe.