Try lowering your car too.... usually 5mm is good.
Sometimes when going that stiff the car reacts strange. It will transfer all the weight directly to the tires and even generate more traction, or really unpredictable traction. I would try 22 lb springs in the front and 19lbs in the rear again.
Also try shortening your camber links one or two positions. That should take some overall traction away and help the car transistion better.
Make sure you dont have too much droop as well. The car should only lift about 2mm above your static ride height.
Also try running some swaybars. Just try a thin one up front to see if that helps any, if it does I would even try putting the rear one on as well. Then mess with the thickness of the bars as well. Hope that helps some.
-Korey