another overheating question

Have had my spyder for a couple of months my problem is overheating i have checked all the posts on the subject and checked all the suggested fixes such as relays fuses and radiator these are all fine! this seems to happen when in stop and go traffic my bars will continue to rise until the bike goes into limp mode i can hear the cooling fan running but does not seem to be able to cool the bike! since i live in southern calif this will be a constant problem plus this can not be good for the bike so anyone have any suggestions?

thanks