I've installed lots of crown as a homeowner and have gotten pretty good at it. I enjoy coping and can get it done very quickly with my jigsaw and a couple of files, especially with the basic profiles. I'm currently installing a 3 piece crown (first time normally I just us crown alone) which consists of upside down base on the wall and a ripped piece of 3/4" stock on the ceiling. The crown sits between both. The issue I'm having is I'm noticing that I need to shim out the pieces of crown that go straight into the wall almost 1/4" so that the cope will be nice and tight. if I don't there is almost a 1/4" gap between the bottom of the coped cut and the intersecting moulding. It's as if the coped piece is too short at the bottom. According to my Starret gauge the corners are all 90*.
Has as anyone else had this issue? I almost feel like if I cut it at 48* it should leave the bottom a little longer and maybe I wouldn't have to shim?