Thank for the ping, Steve...
The hard thing about this is like what Charlie Francis said about sprint training: people's highs are too low and lows are too high. It is hard to do these workouts because you don't chase fatigue, you don't chase failure. Make the lifts and walk out. Try to do them with no emotional impact. Don't judge the weights. If it is easy, go heavier next time if you feel like it.
Now, this is impossible for most people. Hell, most people never finish a program, so why do I even worry about it? People want the EXACT definition of easy, hard, or medium and it literally depends. If you are a slow twitch monster who can drive up near maxes daily, your "Easy" is different. I'm a blend actually. For example, in deep squats, if I could do a single...I go keep going and do a triple! Upper body, I was so much more "twitchy" and my maxes were so far above my rep numbers.
Stu McGill explains some of this with my Celtic hips, for example, but it is just the way we are wired too. So, you are going to have to be an experiment of one. If you want "exact" percents or poundage, don't do Easy Strength.
I'm not sure why I understood the concept so simply. Honestly, I don't, but every time I did this I made some kind of weird Personal Record "out of nowhere."