Originally Posted by vmkeith
It would probably be best for you to get a one piece scope mount that is designed for AR platforms. For about $60 you can get a high rise cantilever scope mount from RRA, or the Burris PEPR mount for about $90. It looks like you are using individual Weaver rings, which can cause problems such as what you are seeing, as well as possible eye relief problems.
Jon, your set-up looks pretty low to me. I went with RRA mount mentioned above by VMkeith that I got at Joe Bob Outfitters for around $55. It fits perfect and is rock solid. It also places the scope at the perfect height that allows for very comfortable cheekweld and eye placement. It also comes in a 30mm tube size if you need.
Joe Bob's is a site vendor/sponser and I highly recomend them. Excellent service and quick shipping. Here's a link to the scope mount I bought from them:
Cantilever Scope Mount
They also have the Burris PEPR for around $70:
Burris AR-P.E.P.R Mount 1 Inch W/PTOP
I don't have the large aperture bell on the front of mine like you do, but you can see how it will work well with one.