some things I would try:
- wider front / narrow rear
- roll center >> shorter and lower inner mount on rear camber link
- move arms forward moving weight more back
- softer rear spring/oil
- thicker front sway bar
- less rear droop
- more camber in rear but not more then 2*
I would not try to add more flex by removing screws ... thats just a bigger band-aid for a bad setup.