Another Torsion Bar question:
I am guessing here though I don't see what amount of ride quality increase there is, but...
A thicker bar is stiffer, less up and down movement. So, the "I guess" comes in here... I guess it is due to the added weight of the A/C system, the ever so slightly thicker bars being back what the company wanted. A very certain level of stiffness.
What is your goal?