Grease will clog up the passages inside the springs, I had a 46 that I greased the springs ---then we got a 39 that had only spring lube in the springs---big difference in ride ---ford spring lube (M4628)was a mixture of about 77% ice machine oil, 22-1/2% talc and a little ground asbestos ---ice machine oil is about the viscosity of atf oil--10wt, talc is a lubricant and polishing agent that also fills surface imperfections
grease will fill the lubricating passages in the spring leaves keeping the lubricant from migrating to the tips of the leaves
Ther shocks are adjustable, should move steady up without a lot of effort, but take a lot of effort and time to move down
I have adjusted with a 50 lp weight on a 2 foot lever to take 30 seconds to 1 min to travel 20 degrees for my A shocks