If your riding power I wouldn't see much use for carbides. On the trail too much carbide can be dangerous. The skiis will bite sending the back end of the sled around. Studs and carbides kind of go hand in hand, the more studs the longer the carbides you need to keep the handling balanced. With your Powder Special without studs I wouldn't go with more than 4" of carbide. Just my opinion and a little experience with too much carbide.
RtkatZL8
RtkatZL8