unless you're willing to give up grip on the flanks, you won't find much harder.
multi compound tires will also have about the same center compound as the scorpion.
your best bet would be:
- michelin pilot road 2ct
- pirelli diablo strada or the new good looking pirelli angel'st
- avon azaro'st or storm'st
it's either that or actual touring tires, which will cost you cornering grip and lean-angle