If you have access to a good machinist with a lathe and the proper tool to hold that ring you can have them back cut down to the width you want them to have
We use to do that in NHRA stocker motors a long time ago to reduce ring tension on both the stock top and second rings and use ring spacers behind the rings to get the proper .005 to .008 in and out play
It sounds to me like a lack of communications on the radial width of your ring set for your pistons got mess up