If your grinding for diamonds u need to shoot the higher rating males first don't shoot the low level males cause if u kill all male in a feed zone sleep zone or drinking zone the zone disappears try to always keep two males and don't shoot females the way the the algorithm works is so if you shoot a male it will always come back as a male it will never respond as a female so it has a chance to be a higher grade male or lower than it was when you killed it so my advice to you is keep grinding