I am currently thinking that a complete life is a mix of pleasures, both short, medium, and long. I think intensity will naturally vary on its own.
That presents the interesting question of how to view our desire for intense pleasure that does not last long. You indicate "naturally vary" but I be we can influence the mix by our choices.
It does seem Epicurus' statement indicates we should weigh intensity in the balance of what we pursue.
I think that's a good point for discussion and will illuminate some of our other issues. I know I often think myself in terms of the longest being presumably the better, but on further reflection I think we have to discard that as a "presumption."