Getting the most out of a low comp 440

http://www.csgnetwork.com/compcalc.html

If I got taller pistons, they're heavier, right? So then I have to re-balance? I have a precision digital scale at work...can I lighten the taller pistons on the inside somehow? Polish the rods down a little overall to lighten?
Maybe just have to chk...wouldnt have to rebalance but would be a good idea....and yes on the lightning of the pistons and rods which would be part of rebalancing...