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You need more camber in the front and less in the rear. You need at least -2.5 in the front to keep outside tire wear down. Even with very stiff front suspension and limited roll you will still need at least -2.5.
-3.5 is too much in most cases. Some tire manufacturers do recommend up to -4 few run those numbers on a track.
The rear of the car should have less negative camber than the front. I think you have too much rear camber to start with.
Why do you need to fiddle with it? Just set the front camber to -2.5 with zero toe and drive it like that. It will not cause excessive tire wear with zero toe.
Camber isn't used to "fix" how a car feels or drivers. It's used to maximize grip on the tires. You need a probe tire pyrometer and a lot of testing to maximize the tire temperatures first. First you have to find the optimal tire pressures. After that your find the optimal camber. Then you leave those alone and deal with under/oversteer by adjusting swaybars, shocks compression/dampening, etc.
If you have to run non-optimal air pressure or camber to balance the car then something on the suspension is not right. Most likely cause is incorrect spring rates/swaybar or improper shock valving/setting.
The compression needs to be set on the track before the rebound.
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