Make darn certain that the springs on the underside of reluctor plate are still there and in the correct places; I have a MP dist. with some similar issues (regapped, replaced reluctor, etc), only to find one of the two springs had come off (if it was ever installed to begin with!) and was jammed in the dist body.
I'm currently using a crusty 73 dist, but at least this one has an operational vac advance!