I'm installing an under eave "J" mount for my slimline, because it has to come off my roof for the new roof I'm putting on.. Anyway, it goes on a rafter tail, and plumbing it east/west is easy, because I can rotate the mount either direction. I have that plumb, with the bubble dead center between the lines(stabila level too, for whatever it's worth), but north/south isn't quite as easy. I did pick a rafter tail that was almost perfectly plumb, and thought it was amazing that I found one that was, and when I dry fit the mount, the level showed perfectly plumb.....bubble dead center, but once I tightened a couple lags down, it's just slightly off center between the lines.......closer to center than to the line it's leaning towards, but not dead center. My question is"am I taking this too far? Can't tell you how many posts I've seen where people say "absolutely, perfectly plumb both directions", especially with the slimline, but maybe I'm just being to anal about this. I tried shimming the top of the mounting plate with what I thought was a very thin piece of aluminum, but it took it too far the other way, so do I call it good or keep tweaking it? Someone here told me that the north/south can be adjusted with the dish if not perfectly plumb, and the guy that I probably will have aim it when I move it sai it should be perfectly plumb both directions, so I'm just not sure if it's worth continuing to mess with it, so thought I'd get a general consensus here. Thanks in advance!