Hojo, The Raven is specifically designed for sport touring, so the tire is different from the Shinko sport bike tires.
I have had no problems with the Raven in the rain even at freeway speeds. I also contacted Shinko about making a matching front tire for the ST and was told the demand is too low to make the 18" front. Why doesn't the ST have a 17" front tire? What does the larger size do for the rider?
I agree they are two different tires, but I now wonder about the quality they may have in general. I just saw some more photos within the last hour of some more failed tires.
I bought a Shinko, but tore a chunk out of the bead trying to install it myself. Never got to try it out... Lanman had a Shinko on his at CampStoc, but he had to get a new tire over that weekend as the Shinko wore rapidly towards the end. He only got something over 3k iirc.