Oops, no replies to this thread for a couple of weeks. I figured everybody thought I was crazy - and they'd be right.
Anyhow, I have about 600 combined miles on the groove job. I didn't expect to but I felt no difference in wet pavement handling. It rained quite a bit here lately and I managed to do a few familiar back road miles on wet washed out asphalt and slick hard pack. I must say the bike felt more planted than with any street tire I've used. So while I focused primarily on rear traction, the front tire showed the most improvement - more than I expected.
Most importantly, another inmate quoted an earlier post of mine where I described the bike as a bit twitchy over 80mph. I dealt with it by playing with the tire pressure but now I know the problem was caused by the Dunlop D616. Any hint of twitch is gone now thanks to the Shinko. The ride is much more solid at high speed - the bike feels good.
More to come . . . . .