I don't think you understand PD 10. If you take it in context with the entire body of writings, it is very clear Epicurus places nothing above or equal to pleasure. The problem is that the pleasures of the profligates not only produce more pain than pleasure but that they leave anxiety unaddressed, and thus they can't produce complete pleasure. They leave the pain of anxiety. And he is talking about limits not because of the modern concept of "knowing our limits." He is referring to the understanding that once you have removed all pain, you will be full of maximum pleasure, a real and wonderful feeling, and that we are not (as was argued in his time) forced to seek more and more pleasure endlessly, if there is no pain. He is saying complete pleasure can actually happen for humans.
Yes. There's a problem with the pleasures of the profligate, and I think you described that problem well. I'm not seeing where we disagree.