I agree, look to matching your spring rates up first. Being QA1's I'd assume the standard 350 lbs spring.
Most likely coming down on your bump stops and unloading the rear end.
If you are serious in performance stiffen up the subframe and look into a different spring and shock set up. Rear should be fine.
Support down bars for the front, cross bar right above the sway bar and weld up your subframe seams.
I'd like to see a video of your runs.
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