I had the same problem when I put the mild springs on my Model 3, which was super embarrassing. Contacted UP, and they sent those black plastic coil wrap things, which weren't included in the original box.
However, I didn't notice an improvement to the ride and was bottoming out on moderate speed bumps (again embarrassing). Plus it costs about 500 to have them installed and would have cost a lot to just put those coil wraps on.
So, I ended up paying for them to be totally removed from my care, returning to the OEM springs. Not wanting to push the problem to someone else and not getting any real response from UP, I ended up throwing them away.
I live in Florida, and I think that's my problem. It seems if you don't live near their physical location, the support is very lacking. Installing their products presents a risk that's too dire for me.