If he is biting and latching on its a food response. If he just biting and retracts them it's a defensive bite.
Handling him once or twice a week is a lot so only Doing it that much wouldn't result in that behaviour. If he is lashing while in the tank then calms down once he is out (which it seems like it is from what you wrote) that is just the snake being cage defensive. It's common. Generally just pulling them out with a hook is how to avoid issues.
Don't feed out of the tank. It's accent bad advice that doesn't die out because too many newbies just hear about, and it sounds reasonable, so they do it but it is completely unnecessary and has a better chance of a snake not eating then just feeding in the tank. Talk to anyone that is more experienced with snakes and you will see the vast majority just feed in the enclosures with no issues. Feed in the tank and just use the hook technique when you wanna handle it. Generally bps are so docile you don't even need to use the hook technique when you still feed in the tank but it sounds like yours deffinatly would.
If your issue is just the snake has become cage defensive it might seem like a big thing but it really is something that is easily balanced by using a hook and then it basically isn't an issue.
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