Dave,

I said Clarity was considerably less volatile, not non-volatile.  Banvel-type dicamba would wreck soybeans a half-mile away frequently.  I've never seen much of anything from Clarity (not disputing your experience) unless physical drift was involved.  The chemistries have been studied extensively, so this isn't something I just fabricated in my own mind.  Sorry to hear of your experience.  Maybe I've just been lucky so far.