well, first let me say you look fabulous and the bag goes great with your outfit! It sounds like most of your crease is from packing/transport? I had a small but very bad crease in a new epi Alma recently (from travel back from Paris, where I was lucky enough to have it purchased for me as a gift, so I couldn't really complain about the crease!!), and it took several days of letting it sit stuffed with t-shirts before the crease went away. I understand that your bag is canvas, not leather like my epi Alma, but still, I'd give it a couple of days stuffed to see if the crease disappears.
Once the packing-related crease goes away, the bag might have occasional small and temporary and minor dents in it, simply as a result of the shape, but that doesn't bother me at all. It's certainly nothing on par with the infamous Speedy sagging -- which DOES bother me personally, but I know doesn't bother others at all! If the Pap gets a small dent in it now and then, it's because it is constructed from a fabric, a pliable material, so I think a little bit of that, occasionally, is fine. I wouldn't want to be carrying around a hard round case, like a cardboard poster tube or something!
I have a Damier Pap 30 too, and I love it -- it is such a unique shape. I hope you try it out for a few more days before deciding to return it. It looks so great on you!! Good luck with whatever you decide!!