My ...I was having issues with breaking valve spring after 80or so runs. They were comp 944's @1.95 height. Right around 200lbs seat as I recall. So per advice I switched to k-950 k-motions at the same installed height broke those too. I since then have looked at the removed pressure to find that they were at 160-170 when removed both the comps and k-motions. Last year I replaced them with another set of comp 944's . This time I paid more attention to the coil bind and seal bind measurements and set them up around 1.86 installed which was about 270lbs on the seat (newly installed) as I recall. I'm at work and don't have my paperwork handy. I haven't lost one since. This was on the 23-770-9 comp .690 roller.