the truth revealed!
I conducted some experimentation with protein powder. 140° is not the cut off temp to avoid clumping. In this initial test I only went to 160° but the point is it was not visibly or textually changed. It was still smooth. This was using isopure unflavored zerocarb protein powder. Which I then turned into protein coffee. I plan to try the recommend sweet spot for coffee temp. Which is 195 to 205 range just to see how high it will withstand before clumping occurs. Whether or not the brand of protein affected the results I don't know or if the nature of it being unflavored had anything to do with the outcome.