all the top guys have posted in so There is little for me to add.
I would say its good to start drawing the line in teh sand and saying that over 450/500 its a good time to start getting more robust parts ready if you want to push much farther.
I also don’t think sticking with stock pistons is good when your looking at pushing the power. I know CV has several pix and a few paper weights from people that kept the stockers in.
There are lots of godo pistons out there…just make sure you do your home work.