You absolutely can over feed a snake.

Stick to a regular feeding size and schedule. It is not worth your collection health just to be able to breed sooner. I personally would not buy a hatching from a breeder with obese and under age snakes. You could really hurt your reputation with these practices.

Just like a horse, dog, or person can over eat so can a snake. Some are just pigs. Both my gtp and ball act like they want second rats but they only get what is right for them.