the other thing is...if you keep knocking off those queen cells and they swarm anyway, you have left your hive queenless. better to deal with it another way. in a really big hive, in addition to moving the queen, you can take queen cells and make an additional nuc. you don't want to overly weaken your big hive, but a couple of splits off a big one will insure that you don't lose everything. best done on a mature hive early in the year when the impulse to swarm is strong. extra hives, extra queens....