i like the "if it ain't broke dont fix it" answer. when i read this what question came to mind for me is what do you have to get out of a litter to consider it a high percentage litter? some may believe that one ACE out of a litter of 5 makes it worth doing again, some may need 5 out of 5 to be just game-plugs to feel its worth doing over. im low on chain spots right now so for me to consider doing a rebreeding i would need more then one ACE out the last litter. jmo