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Besides the camber change and tire compound change, consider the spring change. Spring rate change in itself is not linear. You have to consider motion ratio of your suspension components.
From just looking at the spring rate change, your front wheel rate has increased by 100%, but your rear wheel rate has only increased by about 80%:
Wheel rate of 4/5 kg/mm (F/R): 3.5/2.9 kg/mm
Wheel rate of 8/9 kg/mm (F/R): 7.0/5.2 kg/mm
Your ride frequencies have also changed to where the front now has a higher rate than the rear than before.
4/5 (F/R): 1.8Hz / 1.7Hz (approximate)
8/9 (F/R): 2.5Hz / 2.3Hz (approximate)
To put it simply, you should have gone with 8/10 kg/mm springs if the intention was to keep the difference in wheel rate between front and rear the same as 4/5 kg/mm.
I'll try to answer your last question to the best of my understanding. Anti-roll bar rates increase with torsion, and they may have less torsion if you have stiffer springs that reduce roll. Your bar can be less effective when used with stiffer springs, and depending on the bar, it may increase in rate more quickly than springs do for a given amount of compression/torsion. It's possible to have the same total roll resistance on two cars with each using different spring and bar combinations.
TL;DR: Soften the front bar. More front camber, depending on tire temps. (Without further discussing in detail how the car is understeering)
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