1600 nomad clutch slipping.

[phatnomad]

I took my 2005 1600 nomad for a ride this morning and noticed some clutch slipping. I have done a little research and read about replacing clutch spring with oem replacement, replacing spring with mean streak spring, using "judges washers", or replacing clutch with gorilla clutch. What has worked for those of you who have had this problem? I bought the bike in 2007 with 19000 miles on it and it now has 105000 miles on it. I have done nothing to the clutch since I bought it. Thanks for the help.
Gary