DonMac
My backyard
Tallest Clearview windshield. Fully loaded panniers and Givi top box. No pillion but a small dry bag on the rear seat. 125 mph on occasions and no weave for 5000 miles. I believe you are over thinking the issue.
I just did a test today and removed the top box. I did 225 miles solo at varying speeds. My mileage dropped from 49.5 to 46.8 without the box. The box is going back on.