Try this method taught to me by Buddy Hall many years ago. Rack the balls as best you can. Pull the rack up. If the one ball moves forward, re-rack the balls to where the one ball rests. Remove the rack and check for tightness. Keep doing this until you are satisfied. Spin the balls behind the nine and be sure they are tight. Sometimes a table will rack perfectly on the first try. Sometimes it may take a while. If all the balls are tightly racked, your opponents chances of breaking in the nine go way, way down. Watch a good player break a rack with the Magic Rack. First thing you might notice is the nine ball hardly moves. That's a perfect rack!
Lyn