RE: both eyes or one eye open?
i shoot with both open also. i only have one pin so i can line up the peep, pin , and spot like a triangle.
the string is dead center on the tip of my nose and the peep is over my right eye. i start by looking at the pin first with both eyes open, then bring the focus to the target. the pin is a slight blur but still solid enough to be able to set a good anchor and release.
PT