I've got an '04 1100 Custom and ride double most of the time, with a combined weight of about 360 lb., 200 for me & 160 for riding partner. I'd like to know if any of you have any advice/comments/etc. on improvements to the rear shock and or shock spring? I think it bounces to much and I'm not sure if a heavier spring such as the Eibach spring rated at 800 lb. in. would take care of it or do I need to replace the whole thing, maybe with an aftermarket unit or even an air system. The bike has 25,000 miles on it, don't know what the normal life of the shock is.