It could be your tire choice + rear toe-in combination. High tractioned track + high traction tire compund can create a double effect in addition to 3 degrees of rear toe-in which may be the reason for your car to break loose in the rear. Try switching tire compunds as it incorporates 80% of your set-up. 335 has been the go to set-up. I'm surprised to hear that it's not working for you. Bring your anit-squat at 2 degrees and your rear toe-in plate at 2 degrees as well. Try going up 55 wt. in the front and 45 wt. in the rear of your shocks and have your read droop set at universal level. Hope that helps. Check out my set-up if you want.
Also keep in mind that your driving style can be a major factor as well. running 335 requires you to be gentle on the throttle when entering the corner because your going to have a slight push in the rear.