I’ve always felt that Jaguar “softened” the X300 as compared to the XJ40 and then softened the X308 even more.
Always been a balance of Space, Grace and Pace but I thing tbe scale has been tipped over to Grace at the cost of Pace.
My own VDP wallowed far worse than the few inches of extra wheelbase could explain next to my '97 and tbe '97 never felt as “tight” as my much higher miles '91. Leaving the VDP wheels and tires alone but replacing the rest of the suspension with X300 XJR bits made a huge improvement.
So yes, i think the X308 has a slower ratio rack the X300.