Harsh ride!

[sketchy]

Hi guys,
I have recently lowered the rear of my ae86 by installing some rear Driftworks CS2 suspension.
Since i have changed from standard rear suspension this has caused the back end of the car to hop and judder quite a lot. This feeling is very bad if accelerating whilst going over a bump!

Me and some friends think the ride may also feel too bumpy because the springs are too stiff? Though the springs are 6kg, which is a popular choice on the rear? Is the 6kg spring rate coupled with a lighter ae86 (stripped interior, lexan windows and FRP tailgate) too extreme of a combination!? Or is it not the spring rate at all…..

After some reading this hopping seems to be a fairly common side effect to lowering the rear of the car and can be resolved improved by installing some traction brackets to align the geometry nearer to a standard position. Currently looking at the T3 ones?
Would a set of adjustable four links also be necessary/advisable? If so, what is the best method for installing/setting these up?

Really appreciate some views/advise on this so i can enjoy the ride in my car again!

Cheers

James