DD GT3 RD said:^great post. I agree but I'm not sure how to maximize front end grip anymore?! So I increase the rear bar to reduce understeer
Assuming you start with a neutral setup:
Making the rear bar stiffer reduces rear grip, which means that while your front grip has stayed the same, you've reduced the rear grip and now the car is comparatively more loose.
Conversely, if you make the rear bar softer, you increase rear grip compared to neutral, and now the car is more prone to understeer because there is comparatively more rear grip available.
Same thing follows for front bars. Soft = more grip, stiff = less grip.
However, soft also = more roll, so ideally you want your springs to be able to compensate for that. In roll or turning situations, the swaybar acts as a spring.
Running Strano's adjustable front 35mm and rear 22mm (smaller diameter--softer than stock), I really like the way the car feels at full soft in the front and "middle" in the rear, with the spring rates I'm running, on a square setup.