Personally, 5 grams isn't that much, but if you're going for a neutral balance, then take 5 out of each piston. It's not hard to do with a heavy piston.

Just for thought though. We rarely balance neutral on an all out race engine. Depending on what it is, what RPM it's going to operated at most of the time, and what we think windage could be we'll either go for an over balance, or under balance, meaning we're either adding to, or taking away from what the actual bob weight is.