You're way over thinking this. Piston weight is an entirely different thing than rod weight...and big end rod weight is entirely different than small end.
Stick the pistons in there and don't give it a second thought.
I bored a 360 out .030 over and stuck the speed pro pistons in there and didn't even weigh 'em. No issues, ran it, raced it for 4 years and ran great when I sold it.
Not that it think weighing and balancing isn't a good thing