Looking for a good rear tire that performs well on wet rock. I currently have a Michelin XC12 that works well on all surfaces but slips immediately on wet rocks. I am not interested in a trials tire but need something for the Pacific West coast winter riding = wet! Our riding in BC is wet and rooty but quite mixed terrain so it can't chunk as soon as it sees a sharp rock. I am thinking Pirelli but not sure.... thoughts appreciated.