Would it be worth contacting Omega Pistons ? They helped me out a few years ago with circlips and rings on a MHR Ducati I was rebuilding which had their pistons fitted. My G3l has rings from Cox and Turner, it has done about 800 miles since I rebuilt it. Think I'd better check them out as part of the job...
What we have deduced is that the rings are worn down more on the ends and it's suggested by C&T that maybe they supplied me with oversize rings instead of standard? (correct rings coming)
My other though which I'd appreciate feedback on, is that since my engine breather was not working, ie fully open on the upstroke as well as the downstroke.....Would that reduce the oil mist being sucked up the bore by the vacuum on the upwards stroke by a working breather flap valve?? (The breather is working properly now). Ron