I don't have any experience with this, but I personally wouldn't breed a 2 year old female at 1000g. I have two females, both close to 1000g, one is 1.5 years old and the other is a bit younger, and I wouldn't dare breed them right now. A 3 or 4 year old female that is short and stubby at 1000g? Maybe, but I'd still shy away from that. I believe its about the look of the snake more than the weight, and also how aggressive of a feeder they are.