When you use a gapless ring on the top position it make shte 2nd ring flutter which can and may cause excessive oil consumption at WOT shruggy work
Been there, done that once a long time ago puke No gapless rings since tsk twocents
I've also learn the lesson on to tight of ring gaps runaway Drag race motors run better with looser clearances almost everywhere up

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)