I have 2 08's one Venture GT and one Venture Lite and I looked into studding, well all I can say is good luck I haven’t heard any good out of studding either one. Is the suspension set up correctly for 2 riders? What carbides are you running? Etc...
I have no issue with traction on my GT and I'm a 225lb guy that sometimes rides double with the wife and or teenage children. The biggest thing was in the steering, take the factory 3in carbides off and get at least 6in or doubles that will make a world of difference.