According to the directions I have on my box, SP2 adjustments are separate from the top fast adjust and can only be done when the bottom of the shock is disconnected and fully extended. SP2 is adjusted to soft by turning the shaft 360 degrees counterclockwise and SP2 is adjusted to performance by turning the shaft 360 degrees clockwise. Then, the top adjustments are there to "fine tune" the soft mode or the performance mode. I have one of the shocks in my hand right now, but, I do not know how to tell what the default setting is for SP2. The directions say to just turn it one way or the other, depending on what you want, but, it does not say what the default setting is.... There are also some graphics on the bottom of the shock cylinder next to the "SP2" logo that describe the procedure. I have circled the directions for the "SP2" adjustment at the bottom of the shock in this pic below.Hmmm, maybe there is another main adjustment I'm not familiar with (certainly possible) that is an overall soft/performance setting?
I use the three fast adjust settings. 1 soft, 3 firm and 2 that allows you fine adjustment from soft to firm. Apparently you can actually make it softer than 1 and firmer than 3, a by using the number 2 knob and the fine adjustment.
I still need to play with it a lot more but right now I use 3 for the highway. 2 at the very middle for fast offroad. 1 for slow rock crawling type off road. I haven't tried this yet, but if something was seriously off-camber I might flip them to 3 for a little more stability.
If there is another overall setting I would definitely be curious to know.
Based on what I have read, I have no experience yet, a light JT with light 35s or 37s can benefit more from the soft mode; and a fully loaded Overlanding JT with beadlocks and 40s may like the performance mode better as the default setting.