I suppose you could look at it like a higher effective spring rate but what is really happening is that the force is bypassing the springs all-together. You would have no body roll if the roll center and the center of mass coincided exactly. Even if the spring rate was 10 pounds per inch.

What you are looking at with wheelbase and center of gravity height is the total lateral load transfer, which in steady-state turns is independent of anti-sway bars, dampers, and otehr springs. It would exist if the car was a go-kart with no suspension. This means there will still be roll of the chassis relative to the ground due to tire deflection (and deflection of the "rigid" suspension members). There will be no roll of the body relative to the suspension and wheels, though, if you have sufficient anti-roll.

Widening the wheelbase and lowering the center of mass makes for less lateral load transfer, more even tire loading, and so more grip.

try an early 3.0 turbo and see if it handles similar to your 911. my 77 has the short bellhousing tranny, keeping the motor in the same place as a 911, she tips the scales at 2590 with a 40/60 weight distribution and 50 cross. I couldn't ask for a better handling car!