I would use Loctite if you have had issues in the past. Never seen Loctite hurt a thing. Use green or blue and you won't have screws coming loose. The torque will change. It you torque to 25 wet (with Loctite) it will stress the scew more than 20 in/lbs dry. Don't over think it though. Use the bent wrench method with a dab of Loctite.
