Yaz, I camped with my org the mantis queen a couple dozen times, I love taking my ADV in there.
But it kinda works like this when I was timing everything. It seemed to me to be a 1/1 drop rate for the QB on the mantis queen, you get a deffinate egg and blade each time, out of 8 total kills we got 8 blades and 8 eggs. After that if you clear the room, the spawn returns about every 10-12 mins a new breeder comes back, then the (cant remember what its called) non-breeder up on the north side, then 2 breeders spawn 1 min apart, and at last the 4th one spawns. Then the cycle repeats then the queen pops again. Takes about an hour and a half to 2 hours for the queen to respawn, and the rest of the room cycles twice.
Jagdtyger