I have a mk2 xr2. Ive just fitted a set of spax adjustable shockers with -30mm springs

I fitted it the same way as the tired old gmax things, but ive run out of thread on the top of the rear shocks, so i used a few washers to space them out a bit.

However, its horrible on the road, feels like the back is swaying around a bit.

Can you get uprated or solid top mounts for the rear? As in the rubbers that sit on top of the shocker and the rubbers the bolt down inside the car?

I have a strut brace fitted, its stiff but can pull it side to side with a bit of force...

Any ideas?