So I got a Bushnell TRS-25 for Christmas. I want to put it on the AR-15 I assembled from PSA parts last summer. My rifle has a fixed F marked front sight. The mount that came with the red dot is way too low. I am looking at mounts. From what I can tell if I go with a medium riser it will give me absolute co-witness. If I go with a high one it will make it lower 1/3. I understand the difference between the 2 and am thinking about going with absolute co-witness. Is there any reason lower 1/3 would work better. Also any mount suggestions are welcome.