I would suggest rebalancing, and keep the pins that were in the original pistons. The cranks are super LW to begin with, so consult your balancing shop if there is enough room left to add mallory metal? Some of the cranks have such tiny counterweights, that they're entirely heavy metal with little to no space left for additional balancing weight. I actually have some cranks that have heavy metal in the bored out rod journal just to make weight. I can show pictures if you need to discuss with your balancer.

Mike