In the first step I'd make an algorithm that calculates a zap to follower ratio. If you've little follower but receive a high amount of zaps, you're boosted. If you've many followers but a lower ratio to zaps, you get less visibility than the small account with a higher zap ratio. Ideally it should also consider the "zap wealth" of an account. If someone is poor, but zaps a large portion to a specific post, it is a high signal for that post. If someone is rich, and zaps a high amount, but that high amount is tiny in regard to their balance, then it is a smaller signal.
NOT "top zapped" because this is by definition skewed to those with the largest amount of followers.