Please do double check this with other raw feeders on this site (and maybe check out BritBARF on yahoo.co.uk) but I think that, for raw feeding of puppies, you feed 2-3% of their anticipated ADULT weight, not their puppy "as they are now" weight. It's only when they are 8+ months old that you start using their "as they are now" weight.
I'm not certain about this though - I didn't start feeding raw till my dog was 8 or 9 months old, but I do recall reading that feeding puppies a raw diet requires more food to deal with their growth requirements.
D