Do you have window screens on the outside of the window?
Those would help, and you should get enough airflow through
the screen to keep heat buildup from being a problem.

Even today (with no window film) the shades alone caused the window to get
so hot I could not keep my hand on it.

The window screens were on the inside (between the shade and the window).
Today I don't have the screens installed, since I had to remove them to get
rid of the window film, and will install them again after I have new glass
panels installed (looking into getting low e) for the two adjacent windows.
The screens did not help since they were on the inside of the window.

Frankly, I'm afraid to continue using the insulated shade with the side
tracks since it causes the glass to get very hot. I'd even bet that the
insulated shade played as much, or even a greater, a role toward causing the
crack than the window film (since the window film was not very effective).

J.