I had use a rolled up rubber mat for the stud (3.5 pounds) when when I bred Cozy. It was a hands on process. I held her to make sure she did not harm ie start to walk from the male once they were locked and his owner supported his body in the air. The process was then repeated every other day x3 breeding to ensure it took.
Your girl may have attacked the other males because she was not ready yet. Cozy was grumpy with the male at first for the breeding even though she already knew him. I had to bring her everyday til she was ready to accept him. It should always be the ladies chose.
