I think the concept of "flush fitment" can be subjective to a certain extent. I consider flush for me what the front wheels look like with 9"wide wheels with +35 offset. Anymore than that looks too aggressive for me, considering I'm not out to drive it like I'm on a racetrack. What bugs me is the rear wheels. I think it's right around 5-10mm too sunken in for my taste. At 19x9 +35 squared.
Also, the flushness of the wheels are impacted by the camber that occurs from lowering the ride height. In my case, I prefer being dialed in right at three quarters of an inch compared to stock, so I don't necessarily need too aggressive an offset for the rear wheels, just a tad more than the fronts. I could go lower, but I have been at 1.5," 1", and now this, and I prefer it most. It's almost double that of the p3 ride height, but not low enough that I have to constantly worry about scraping or driving at an angle for certain inclines. Plus, I like the even wheel arch gap look with this setting.