Correct spring rate for QA1 coilovers

Looks like DR3955B QA1 shock, which takes a 7-9" spring. You probably just need a stiffer spring. You could measure the OD of the spring round stock and call QA1 to see if they can identify the spring for you based on the thickness of the material. Otherwise, get creative with a drill press and bathroom scale, and you could measure the spring rate well enough to identify the spring?