Have you purchased tires from the motorcycle superstore.com site? For shinko tires they're sooo cheap!!
All their tires are priced great there. I had an issue, as well as Wayne, with the bias ply Shinkos. But there are many happy Shinko people out there. If you get one that needs an extreme amount of weight, make sure it's mounted right and not running out like mine was. Send them back if they do run-out. Don't let a shop tell you it's ok to have the wheel lines with weights. I've been running Dyna beads after getting the tire positioned for the best balance possible. Of course you have to mount your own to go through that little bit of hassle. Tire tools are cheap. And no one cares about your wheels like you do.
Steve-o