The job is wood framing basically like a large house. I generally use 4" square bracket boxes screwed to the stud, in the past it seems like with the box installed correctly using 1/2" plaster ring on finish most of the boxes are to far back from the finished surface. I would assume from the lumber not being true. I am tempted to use 5/8" rings on the 1/2" drywall but know I will get burned somewhere, with metal studs I use a H23 Caddy bracket and have no complaints, what are you guys using in this type of installation.