Orleans is a different Bart, not me.
Might not be enough material in the piston top to cut a dish deep enough to get where you want to be.
My advice would be to have Ross make a dished piston set to your specs like I did. Expensive but worth it, you end up with what you want with no guessing.
Cost would likely be in the $200 range to cut a dish, you really might not save much buying lightly used pistons and having additional machine work done to them. However again there likely isn’t enough material in the piston top to cut a dish deep enough to effect a drop in compression.
Ross flat top pistons are lightweight with not much material there as compared to a heavy TRW or Speed Pro piston, a Ross dished piston is made differently to accommodate the dish.