I'll throw a theory out there as a placeholder for future thought.
Ryan, Matt, and others smarter than me please chime in with your thoughts.
With such a light spring rate, spring mass begins to nearly be the same as unsprung mass.
Never had this issue myself, I imagine you have to get creative in order to get the unsprung mass to be compliant.
If they were equal masses, I would think it would be tough to get suspension to work well without upsetting the chassis.
Definitely don't intend to hijack Dave.
Just peeking into the rabbit hole.
