I think I can save you some of the guinea pig work.
My wall had Glidden Gripper primer on it. I'm surprised the off-axis sheen was so high on it (and that you could fix this by adding poly to it!!! :-), but that would explain why I could see my wall imperfections so easily. The Glidden primer did have close to a satin sheen to my eyes. The GTI N8 I have on it is *MUCH* flatter, so I don't see any reflections off it at all, even off axis.
The one nice thing about the Glidden primer was that the off-axis sheen gave really good off-center viewing angles; the image looked the same even at 45 degree angles. I projected an AX100 on it and the only tweak I had to do was to cut the color intensity in the menu or everything seemed too oversaturated.
I've attached an image I took of a football game on it and an image of The Return of the King (when Theodin gets killed by the wraith). As you can see the fleshtones look great.
edit: ok...now they're attached...da** 800x600 size limit...