If you are feeling as much pleasure as possible with no hint of pain, there's no way that could be increased.
I don't understand: using the expression "as much pleasure as possible" sounds like begging the question, but even if allowed, it seems to me one could have for example just completed a great meal and feel pleasantly full and have no bodily or mental pains, and be comfortable in a Lazy Boy chair and yada yada, IOW be just as content and full of pleasure as one could be - yet - if a favorite song comes on, or one's best friend whom was away for several months surprises and walks in, or any myriad of other pleasant things would suddenly occur, one's pleasure would increase, no? If those things happened to me, I feel certain I would experience an increase of pleasure. What am I missing here?