Your Cal King looks a lot like mine. He's a little over 3 feet and about 330g. I feed 10-15% of the snakes weight every 5-7 days. That's about 35-50g per feeding. The medium mice or rat fuzzys I use average 17g each. Thats 2-3 prey items. It sounds like a lot but I don't think it's overfeeding, especially if you occasionally vary your meal size and feeding frequency. I'm finishing off some smaller feeders and ordering some rat weanlings and small rats in a week or two. This will allow me to feed one larger prey item instead of 2-3 smaller items. Kings are big eaters and you don't want to overfeed them, or any snake for that matter, but as long as he's not getting too chunky and pooping/shedding without issues I wouldn't worry too much. Best wishes with your king.