So I have to update this review a bit because I discovered some things with the rear suspension today that were negatively impacting ride quality. I asked HKS for input on my experience with these coils recently and they suggested that my alignment guy may have set ride height by adjusting preload which isn't correct with this suspension system. I looked at the preload on my rear coils and I discovered exactly what HKS suggested might be the problem. Here is the picture before I started doing anything:
So I undid the preload and watched the coil nearly unwind to the bottom of the shock before it fully loosened. Then I turned it 4 full turns to snug it up and tested. Man night and day difference! I have to say while I found bumps and dips not nearly as jarring as they were, I found the car really bouncy now. I turned up the damping setting to 16 clicks from full soft and that seemed to settle it down but it's still pretty bouncy over bad bumps and things. Anyways, I checked ride height and found the car had settled half an inch lower than it was so back up it went and this time I turned the shock body to raise the ride height and then I took this picture before I set it back down.
This is much better than it was and I no longer feel my teeth vibrating when I go over bumps or dips in the road. I kind of wish it wasn't quite so bouncy but I'm hoping that will clear up over time as the coils re-settle. If not, I'll take another crack at setting preload next week and see how it goes. I felt like I needed to update this review because my findings have changed and I can now whole-heartedly recommend these coils knowing that something was just set wrong with mine.