Instability in rear end when turning left

When turning left at speed (Between 50 and 70) the cars rear end "slides" to the right though there feels to be no loss in traction on any of the corners, it is as if either the out side tire is going from negative camber to positive camber when it hits a bump (the issues is hardly noticeably unless the suspension is moving i.E. Hitting bumps when cornering).

I have noticed that the right rear side of the car does sit lower than the left rear (between 1/2" to 3/4"). So to rule out the possibility that the spring was sagging I swapped springs in the rear end and it still sits lower/ problem is still present when cornering.

The car has been lowered with Eibach springs about 40,000 to 50,000 miles ago and this problem is recent. The rear shocks do feel worn, but the car still settles its self immediately after hitting a bump and the car doesn't feel to have any oscillation after as well.

I have also visually inspected all ball joints and bushings as well as used a pry bar to check for excessive flex/ movement and all seem to be in great shape.

Any help or advice would be greatly appreciated.