I also wondered if that 25% is accurate. I spent four lives going to multiple wilderness locations and only got one imprint. I think it was about ten locations over the first few lives - I kept visiting a new location and then circling back to all the previous ones, and it was only on the fifth new location that I got my first imprint. So a 75% chance for each of the previous lives' locations to fail is only a 3% chance overall. Unlucky, but not spectacularly so. Still, I'll be continuing to keep an eye on it in future lives.