The problem is not the rings, the mount, or you. The problem is T/C. While I like their guns (both of my often-used MLs are T/C guns), this is a KNOWN, FREQUENT issue with the barrels used on the Omega and Encore. Now, some people probably bottom out the adjustment on the scope, get it to zero, and forget about it. I know a few of those. Others can't get enough adjustment or, like me, dial up at longer ranges and can't do that when the adjustment was all used to zero.

The problem is inherent in the barrel of these guns!!! There is no permanent fix outside of buying a different gun!

You have two options:
1) Get Burris Signature rings. These use plastic inserts (half-circle rings) which go inside the ring and hug all around the scope. The 30mm ones come with inserts pre-cast to cant the scope one way or the other; you can use them to introduce a downward cant to the scope to reduce the amount of clicks you need to zero the scope. I LOVE them, I use them on all my scopes. The 1-inch ones do not come with the offset inserts, you must buy a set separately.

2) Shim the back of the scope base. Use the curved face of a soda/beer can and trim so it sits under the base nicely. I used 3-4 layers and drilled a hole so the rear screws guarantee they stay in place.

My long-range Omega uses both of these mechanisms to maximize the upward travel I have. A buddy of mine just shimmed his Encore and shot it at my place last week...worked as I guaranteed it would.