Adventures in Utopia?

[Khaoticphury]

Presuming I understood the OP's original intention, three books that seem applicable to your scenario:

1) HG Wells "The Time Machine". Because for every happy Elom in Utopia, there's a flesheating Morlock who hates them. Or some sort of guardian or conspiracy that keeps the Selks in line and keeps the machinery of life running ala Illuminati. I'd put an "X-Files" spin on it, with your band of Selks running around trying to get the truth and AI Selk/crazy cults/descendants of the nueral interfaced Selks trying to influence or mislead them.

2) David Weber's "Off Armageddon Reef" A deliberate low tech setting reinforced by religion, with one advanced life form trying to rebuild a technological base to take humanity back to the stars. Naturally, war ensues. Your Selks can be for or against the heretics. Selkie gadgeteers hunted by technology censors might be fun all by itself.

3) Roger Zelazny's "Today We Choose Faces". I don't have a good summary for this one; suffice to say one(?) man is a catalyst effecting the "utopia" they've all been sealed into. I like it for the nested/recursive personality the main character has, kind of like an ancestral memory. I could see one of your Selks deliberately or accidentally created with this trait, where the genetic memory is overly augmented. This would be a longterm and dangerous enemy for your characters. As a character, he could be waiting for certain conditions to be met before he begins his work, or is forced to respond when certain things happen. Kind of combines ideas from 1 and 2.

Hope that helps.