The higher your level gets the better odds you will get, just keep trying. I'm at level 70 now and have the highest morphs you can make and never fail anymore. Just about to break into the top 25 in moneyughhhh this game makes me mad at times. lol I did 10 breedings and all failed and were suppose to have a 20% success rate. hmmm now I got to wait an hour to try it again. lol