I have a 1 year old Mueller 4x16x50. im having a couple issues with. The first is blurry targets im shooting at 1 inch orange dots and they blur so much it looks like theres 2. Ive read and tried all the things with parrallax and eye relief nothing seems to help. also ive noticed the longer i look through the scope will get dark. it starts at the top and goes dark im not moving my head.