Needing to replace old sightron sll 36x on my 600 yard rig. Needs to be 30mm tube and under 1500 bucks. Wanting best optic quality i can get for this cost. I get optical migraines from eye strain caused by crap glass, but not rich either. My 45x leupold on my short range rifle doesn't cause any problems but been having issues with this old sightron. How are the new slll 36x ? Any help is appreciated thanks.