Great to have this data. But wouldn't the extent of dryer-induced shrinkage be driven by the amount of time in the dryer, as much or more than temperature?

While most modern dryers offer a choice of temperatures, the big knob mostly controls a humidistat-based target. I personally equate the "very dry" setting with "shrink beyond usability".

I'd expect that removing clothes while still damp would be more important to avoiding shrinkage than reducing the heat, but I'm no T-shirt scientist. (T-shirtician? T-shirtologist?)