Went out to shoot my new TC encore on Sat. It has a leup. 3.5-10, mark 4 rings, and a cheap base I picked up at bass pro. I'm about 8" low at 100yds, and my scope is out of vertical adjustment! I know I can get burris rings with the offset inserts, but I really like the mark 4 rings. Could the base be the problem? Any thoughts, advice, or any other info will be greatly appreciated.