The CSC rear suspension can be highly adjusted to personal riding. The best place to start is by looking at the CSC installation instructions readily available on line. My research was done with a Honda Goldwing Kit in mind so other models may be different. The kit I have has only one shock absorber mounted horizontally between the IRS. That shock can be ordered in different spring rates.
In addition, the spring can be adjusted in length to accommodate lighter or heavier normal loads. The CSC kit retains the OEM rear shock pre load adjustment to fine tune the shock. I also understand that there is a sway bar option that, I think, may even eliminate the sway bar if hard cornering is not important in favor of a softer ride.
The rear suspension on my bike was set up while the body was removed. I don't know for sure if it can be accessed by just removing the top box or anything else. Maybe someone from CSC can chime in and correct me or add additional information..... Jim