It sounds as if you are jambing, assembling, backmasking, then shooting the outside. As opposed to painting with the nose off and painting the shell with doors on, inside and out in one shot. The latter will leave no tape lines in the jambs and is closest to factory procedure.. If you are going with the first route, one procedure is to tape close to the edge and just pull the tape back a touch to prevent a hard line when jambing. If you do get a hard line it's no big deal, you simply cut it when you final sand. Piece of cake. Why overspray on the panels making more work when you don't have to? If this is not clear I'd be happy to pull some paper off the machine and send you a pic or two.
Keep in mind if you use a sealer much darker or lighter than the topcoat the tape line visiblity in the jambs will be increased. Using a tintable sealer reduces this problem. As well as rolling the tape. There are other tactics and this would get winded so I'll stop here for now. And I have no idea to what level you are taking your project nor it's value.
