Hello,
Theory says when you increase stiffness on one axle, that side grip decreases. But this theory is very basic and there are multiple factors that causes opposite of this is to be the truth. Because of camber change, tire-surface properties, chassis flex, etc.
For example for me, normally when you make rear end more stiff(2.6 spring instead of 2.5) car is more stable at the entry and exit of the corner. You have to try this to have the feeling for yourself.
Shock oil I usually change independently from the springs I use. Of course this doesnt mean you can use 2.5 spring with 1000 oil. 450 is a good starting point, where 500 makes the car have better initial response and traction. But too stiff on very high traction can make your car more prone to traction roll. Dampening also is a very complex topic, so there is not a simple solution which oil you should use. You should try if you have time, and see whats best for you and for the track you're running at.
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