Breeding Brooks kings question

I am having issues getting my Brooks to breed. Whenever I put them together the male always attempts to eat the female. They are proven breeders, they bred last year, and are fed very well. The female is 5 grams heavier than the male. They are both in perfect health. I know they will bite each other when breeding and everything but this is very different. Generally when I breed them he will bit her neck near her head but recently he has been biting her right on the face. Both are displaying signs that they want to breed, he is inverting his penes and she is acting like every other female that he is breeding. Is there anything I can do to stop this from happening?