+1 on this combination. I run 36-37lbs front, 38lbs rear, no grip problems at all.PP on the front and a PR2 on the rear. Very sticky with no slip.
Drop your air pressure some and see if that helps. Doesn't look like your using enough lean angle to be slipping any, so it's probably a sensation rather than an actual slip (if that makes any sense) brought on by somewhat over inflated, worn tires. Do some experimenting on this tact and let us know what happens.
to the Org.