Another work-around is to make the blocks a little bit bigger than you want and trim them down. It adds steps but gives you wiggle room, which I need, myself.
And use a clapper. They're easy to make. If you don't have one, put a cloth on top of one of your blocks after pressing and put a heavy book on top. It can make a huge difference. (real clappers are better if you're going to add them to your process.)
My clappers are made with scrap wood and are adjustable in terms of weight (using ankle weights.)
hugs,
charlotte