you have entered the twilight zone ..........
Infinity made full range class D amps like 15+ years ago, nothing new here.
I would assume the reason why you see most of the threads in here about amps going bad are about class D is because most class D amps are large monoblock amps driving subs AND most of this forum are kids under 25 that are driving these amps HARD ..... many times above it's designed limits. You wanna see failures ? Go to any bass off show, pretty much gaurunteed if there are more than 5 or 6 competitors someone is going home with a limping or dead system.
N2, I used to recommend using 50-100% more power than the speakers were rated for just accross the board, exactly for the reasons you are showing with the charts. Now I ask what kind of music they listen to, if it's mostly rap/hip hop/eletronic bass tones, then I recommend matching the amp and speaker power rating more closely because that music has a FAR greater RMS or average content then actual music does.