If you're not sure about taking all the shocks off (I'd do it and have done it) then take any one off of each corner and see how much it changes. Does not really matter which one by the looks of your setup, since they're all looking about the same length and angle and positioned next to each other.
But if one is longer than the other, leave the long one.
You might verify the part numbers of the existing shocks too, in case that leads to more knowledge.
Your tires don't look over-inflated, but the rears could probably work with lower pressures most of the time. This also serves to soften some of the harshness. Especially if the tires are high rated and have stiff sidewalls. If they're E-rated or more, they're stiff! Maybe read the max pressure and max load ratings on the sidewall and see where they fall in those categories.
How are the rear shackles installed? I could not quite see in the pics, but if they are stock and the open side is facing forward, they're on backwards. If they are aftermarket, then they are probably correct. This does not usually end up with a stiffer initial ride, but it can limit travel and ultimately effect the overall ride. All depends.
Do you like the ride height? You could remove leaves from the back to soften things up a bit. That will lower your height unfortunately, but that can be corrected for with (gasp!) blocks of the correct height.
Same for the coils, but yours look like variable rate versions already. Stiffer perhaps for being 5.5" of lift, but still very likely as good as they're going to get.
What is the rig used for? Looks like it's set up for some pretty serious use, but if you're mainly just bombing around on the road, these things can be changed without causing trouble.
Ultimately though, that much lift and those big tires are not that way for ride comfort.
Good luck.
Paul
