I doubt that it is a rail problem because you mounted the Vortex and it shot fairly well. If Leopold states that the scope is OK after test shooting, it almost has to be a ring problem. A new set of rings should be tried and if it eliminates the problem, you probably can get a refund for the bad rings. I had a similar problem and found where the rear ring attached to the rail there was a small bur on the left side of the ring that lifted it up and canted it right. Another thing you can check but difficult to find without a good magnifying
and lighting. Rings are much cheaper than a 3 grand paperweight. I would also look for either a different brand or a different place to get them if you want the same brand so they come from a different lot. I feel your pain and hope that you will get a positive end from your frustration my friend.