Are they broken in? Marlin 4" springs work really good and are super low after they break in. I ran them untouched for a few years and they rode/flexed almost too good. lol
There came off a truck that had probably over 10k miles on them. The rears have I think 2k ish miles on them.
I think they are either 5in springs, or they are old school, and different than the new ones.
PZ