A stiff rear spring is not abnormal. I'm not sure what you mean about the tyres, they should always be glued on anyway.
It is probably the high grip on the tarmac that is causing it, the front suspension will rise and be extended to its limits on power, so when you steer the wheels will lift and you will have no grip. So stiff rear springs is quite correct.
Also, try some TRF shocks. They have a lot more travel and you are less likely to reach their limits. The car handles much better on all surfaces with them.
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