After all that i do want to agree that DISsatisfaction is definitely a pain, and I certainly want to reduce it to a minimum. But I think what we are circling around here is the philosophical point made by expressions such as not being able to serve two masters.
Allusions to multitasking computers aside, it makes sense that ultimately you can have only one goal, one guide, that takes precedence over the others. i suppose the multitasking computers reference helps realize that "life comes at you fast" and you constantly have to make adjustments in how you calculate what you choose and avoid. From the perspective that constant adjustments are required, I think that's where you get to the practical conclusion that the best label for the goal is simply "pleasure" rather than combining the word pleasure with any modifier.
If you don't properly identify what that one overarching goal or guide is, then you are going to have trouble. I think that's what is mean by considering the real purpose, and then we check our progress toward that real purpose against the data we get from the senses - in this case, primarily the feelings of pleasure and pain.
PD22. We must consider both the real purpose, and all the evidence of direct perception, to which we always refer the conclusions of opinion; otherwise, all will be full of doubt and confusion.