Yeah the coils are good but i think they may have been adjusted wrong or something :l
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whoops forgot to mention that part, most likely they played around with the spring pre load
You could be running like 2kg rear for all you know im not sure how to fix it or ecen find out
If its got two nuts where the coil ends im pretty sure you can just have to make sure you dont loosen the nuts from each other.
buddyclub N+ it is a 2 way dampening adjustment coilovers . so maybe they may have adjust the spring perch & stuffed up the spring load.