The words "loose" and "tight" are sometimes used to describe how much force the driver has to put into the steering wheel then they really mean "light" and "heavy" steering efforts. This is what the CD controls. If you read the Guided Tour of the CD (iRV2 Forums - Files - Tour of the Newmar Comfort Drive system, Rev. A
), it tells how the efforts should get heavier as you drive faster and as you turn the efforts control up. A technician can tell which of these is not working with the diagnostic tool, also linked in the Tour.
These words are also used to describe how far you have to move the steering wheel to achieve a given change in lane placement, where "loose" means a lot of steering wheel motion and "tight" means very little motion. The CD has no effect on the required steering wheel motion.
The words are also used to mean oversteer and understeer but pretty much all our coaches understeer near the performance limit. The CD can't do anything about this, either.
From these posts, I can't tell what problem either of you are really describing.