Feeding Schedule and Sex Clue

[cash]

My two Bloods are growing at an Incredible speed but I am worried about the size and frequency of their meals. They are both able to eat a "large" Frozen Rat from Rodent Pro but it does take quite a bit of time for them to finish thier meals (30 to 90 minutes). Should I feed them a smaller Rat and how much time do you suggest I wait between meals they seem more than willing to eat once a week but I've only been feeding once every two weeks since I switched to "large" rats any suggestions on size and schedules of meals would be appreciated. The Lengths of the two snakes are currently approximately 12" and 18" And each are almost a Year old.

The sizes of the two bloods also makes me currious they are both the same age and yet one has grown 1.5 times as large in the same amount of time with the same feedings. Could this be a clue as to the sex of the two bloods?