Right now, I have a couple balls that are around that 400 gram mark and feed them a weaned every 7 days (Friday is snake feeding day). I usually up prey to a small rat 1x every 7-10 days around 500 grams. Feeding too much too often can be unhealthy for snakes. I would keep the 1x weaned rat every 5-7 days as you are doing until he reaches that 500 gram mark. If you have left over weaners and he'll take 2, then by all means feed two when he's 500+ grams. You may also want to find a frozen feeder company that sells in smaller amounts such as Loxahatchee Rodents (I am partial to them since that's all my snakes seem to enjoy! Clean, stated weights, and shipping is very reasonable).
If you are noticing feeding behavior at non feeding times, it might do you good to incorporate a snake hook into your husbandry. The hook really isn't to pick them up, but a way to tell them that it's not feeding time. When you want to hold or clean, open the enclosure, simply take your hook and "pet" or gently rub your snake's body to get them out of feeding mode and proceed to handle. Always remember to handle confidently and don't let his "display" scare you off. Obviously if he is in shed or that day or two after a meal is not a good time to hold or clean...
How often are you holding your snake? If all a person does is keep them locked up and only opens the cage to feed, then they will associate cage opening with feeding. They need that feeding and non-feeding time with you. By incorporating a hook, your snake will eventually realize: Tongs= food. Hook = No food. It's really Classical Conditioning (Pavlov) at it's finest.
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