You most certainly can tighten rings to much. Seen bent tubes due to over cranking.

Other things to check:
- objective(bell) to barrel clearence
- Visually inspect the scope tube for denting or marrs other then typical ring contact
- Rings are tightened evenly (installing rings is like installing tires you want the same torque or pressure on each screw) Check the gap or spacing on the top of the warne rings to see they are similar
- Bases are in fact snug and not bottomed out on the receiver. When I install bases I screw in the base screw by themselves counting the revolutions till bottomed out. When attaching the base I count the revolutions to ensure its not bottoming out prematurely.
- Swap out scope or rings (then vice versa if problem isn't solved)