What's the best way to get pure bees when breeding? I had a cultivated princess which was pure as far as cultivated goes, but the life-span was shortest and shorter. The queen that produced it also produced 3 pure drones, but 2 of them were shortest and shorter and the 3rd one was shorter life-span for both. So I put that one and the princess back in to breed again with normal impregnated frames, but I've now got another pure princess shortest and shorter, and the 2x shorter drone has been lost and I've got another shortest and shorter one. What am I doing wrong here please? I want to get them so they're pure and all the info matches. Thanks.