My original shocks have only a preload adjustment. Why should I care about adjusting dampening? How would I know that it needs to be adjusted? How hard is it to set it correctly?

I will be riding solo (230 pounds
) often, but plan on riding with a passenger (150 pounds) pretty regular too. Are heavy duty springs a no brainer? I kind of figure that I should get them, but will they make solo riding too stiff? 
I have seen the following makers of replacement shocks mentioned on the forum. Are there others I should check out? One of these stand out above the rest? Here is the list of shocks I have found that fit my GS550.
Hagon Shocks: Type A
Progressive Suspensions: Models 412/418
Ikon Suspensions: Model 7610-1282SP10
Works Performance: No match for model/Year
Thanks.
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