Piston weight difference

Find someone with a paint scale. Measure all the pistons and find the lightest one. Get on the inside of the pin boss with a grinder and dress them until each piston weighs the same. It's not hard. Yeah it's "just" a gram, but how much is one gram throwin around at 6000 RPM? I don't know. If I had them all apart and in my hand, I'd get them dead perfect.