The bass bump has a lot to do with the way John Atkinson measures speakers and probably is not there as much as a part of the speaker's response. The real problem with the Prestige speakers is the mids. An elevation at 10 kHz isn't that big of a deal (to be clear, I would rather a flat response overall), and the spike above 20 kHz is nothing to be concerned about, but that midrange response does not belong on a speaker as expensive as those, especially from Paradigm who have the resources to do better. My guess is that they were so stuck on their X-PAL aluminum diaphragms that they were willing to compromise the response to go all aluminum. But even then, there are much better measuring speakers that use aluminum, like from Infinity and Revel. Thankfully, Paradigm corrected this course with the Premiers which measure fabulously and also sounds terrific. There really should be more chatter about the Premiers, I don't think many people realize how good those speakers really are.
By the way, if you want to get a better look at the Persona's response, look at
this page.