It's great that you are shooting a rifle well enough to see this and to catch on so quickly. What Boss Hoss will send you will serve you well.
Back in my benchrest days I set out to learn the magnitude of the effects of mirage. I was shooting a 40X 222 Light Gun w/a 26X Leupold (or was it a 24X
) either way it would shoot along with your AM out to 200;).
I knew the range very well. Bare dirt and a few weeds between the benches and target. Mirage was brutal, normally. Newbies there would shoot around 3/4 MOA until they caught on.
I set up @ 100 yds well before sunrise. As soon as the 100yd target was visible I fired a sighter to verify zero. Then fired fired for score, so to speak.
I shot one shot every 30 Minutes until 10 O'clock. Compensating for the wind with each shot. I recall wishing that I could do such a good job with the wind during a competition.
Result: a real nicely space group of shots nearly perfectly vertical for a length of 2 inches.
Set your scope on its highest power and get it solid on the bags and centered on a small dot at your distance. Touch nothing and watch that dot do the dance. Then be grateful for a rifle that shoots so well even without knowing about mirage. Then you'll start seeing some "good" groups.;)