I feed mine every 7-10 days no matter what size they are. They seem to eat best for me on this schedule and as long as they eat at least 3 meals a month im happy. Unless the prey is alot smaller every 4 days is overfeeding for your pin imo. You want them to gain weight fast but you cant force it or you'll end up with a fat snake. A toned, healthier, more muscular female will produce a better clutch for you overall, its not all just about size.