Godfrey I don't recall that you commented on "why accept the minimum when more us possible" and I suspect that is key to completing this analysis. There is some aspect to "Intensity" that fits into this puzzle. More intensity has to be obviously desirable just like it is obvious that you want the most duration and locations.
Minimum what? As long as all pain is gone from the body and mind, there is no minimum because you are by definition at the maximum of pleasure (macro). If we're talking about micro pleasures, then the minimum would mean that you're limiting yourself to one location of pleasure or to one moment of pleasure. Once pleasures have accumulated throughout your body and mind, you're at the maximum of pleasure.
It would appear that there's no sliding scale of intensity, other than through location and duration, by definition. At least That's what I'm thinking right here, right now. That may change.