Matt,I have noticed about a 3 inch rise when sun comes out. Maybe from a full cloud cover to bright, it might be a little more. Matt
In your example, if the sun is out at 8:00 am and remains out for most of the day, does the 3” rise in your example hold for most of the day? How often to you go back to sighters to confirm elevation? Tomorrow should be a good day to practice as the wind in the morning should be 0-5 MPH for 2-4 hr.
Ben