I'm sure the ports being on the rear must exacerbate the issue, but in my VERY limited experiences, pulling out speakers from the wall always sounds better. I've mentioned something like this here, on multiple occasions, and have went so far to wonder out loud how many AHers have even tried. I attribute a lot of this lack of experimentation to simple aesthetitcs, you know, "Oh, it sounds amazing three feet out, but I can't walk around my own living room now!". Still, I do suspect many people have not even tried. I have once or twice recommended, in a tiny room, to somehow mark off the best spot, and simply to pull the speakers out to those spots for critical listening. Somewhat similarly to how a person might pull the couch off the back wall, feet on sliders, for critical listening.
I guess, at least in places I've lived, SBIR muddies up speakers a lot, even modest bookshelves, front or rear ported, didn't matter. You will see b pape often recommending to treat the front wall, behind the speakers, no matter if they are front or rear ported. And those are my experiences . . .
Congrats on the purchase.