I am curious, is your three pin driver the QL flex type or do you have the solid older version? The flex type is imperative when using iso mounts. Surprisingly, as smoothly as the QLs run with iso mounts, when adjusted properly do move all over the place and stresses the clutch assembly and drive line. The flex plates eventually fatigue and crack. I love QLs but do realize this is an idiosyncrasy with that series.
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Queen Of The Quietlines! 
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