Most people using dots on an AR co-witness with the front sight - - after a couple of uses, you won't even notice the sight in the view.

Have someone else look through the BSA ... the uniformity of the circle can be very dependent upon your eyesight and also on how tired your eyes are at the time. I use 4 UltraDots and generally have an obvious "comet" rather than a circle - - less pronounced early in the day when I haven't spent 10 hours on a computer. The fractured view is the result of 57 year old eyes with some astigmatism...others see a perfectly round circle. Brightness and size are irrelevant.
/Bryan