Not related to the aerodynamics is the fact that at higher temperature, the rubber on your tyres is softer and that of course makes the bike feel different as far as handling.
Tire temperature does indeed have an effect you can feel in handling. But interestingly enough it is not riding down the road that warms up the tires, it is braking and acceleration.
Thank you for confirming my belief that air density does affect the feel of the wind. Yeah, there is a whole basket of variables in the aerodynamics of riding a bike. Getting a windshield or windscreen (I use the latter) that works is so tough for every rider. I've got an essentially new windshield that I couldn't use regardless of how I adjusted it. Past 60 mph it destabilized the front end. I got a much smaller British made windscreen that for me is so much more effective in directing the airflow around my torso without that feeling of uh oh.
I know what you mean... had to settle on a relatively small windshield for my mbike.