Right now since im getting females ready they are eating weaned/sm rats every 3 days to pack on weight for the breeding season.
As for breeding, theres no right way or wrong way when it coems to weight. Females of any age and size can have egg complications no matter what. Saying a female that is 1200g is more likely to get egg bound over a 3000g female is absurd.
Egg binding usually is the cause of bad genetics and or poor health from being power fed or under fed and not having the ability to push the eggs out.
I start ALL my females first pairings at 1200g. By time the winter goes on and eat eat eat eat and follicles grow their 1500-1800 right before ovulation.
I also have a 5 year old female who was a mouser her first 4 years which stunted her growth. She now eats rats but peaks at 1400g.
This is mostly your decision on what YOU think is right for YOU to do with YOUR snakes. Were here only to give information and your to fine tune it.