you've got all kinds of adhesion going for you,I was just reinforcing what Mr D had said.
You're not putting all That material on In large amounts and not standing it off very and painting over it.if you ground the surface down aggressively and then primed it excessively without blocking say every three or four coats you'd see shrinkage in time. Where you're actually going through the motions here correctly the shrinkage isn't what it used to be. By that I mean the early primers used to shrink a lot because they were put over poor products that sunk as well. It was the domino effect. You're putting a couple Coats and standing it flat etc.
products outgas to an extent but it's not the boggie man that it's made out to be.I don't know what your time frame is from primer to paint is but by the time most people get to the point where they ACTUALLY put color on its longer than anticipated.i wouldn't worry to much about it.
