How to pose a hand like a punch

I tried to rig my hand as good as possible. With the riggify addon. I tried to roll the finger to give a punch pose. when scale the widgets all the fingers get mix with each other. I tried with copy rotation. Nothing work. Any suggestion or help where im going wrong and cant make a good pose of PUNCH (here is the file : https://pasteall.org/blend/8e3f4494ac4b4e3ba10f252d08fdfc4d)