Conti Gtorskin hardshells are really mediocre on road and are completely unsuitable for gravel. Put on either a 38 MM Compass tire or a 38 MM Vittoria Terreno Dry, drop your pressure to 40 PSI or so in gravel and 45 PSI on road and they will be great on gravel and even faster on pavement than the Gatorskins. Those Gatorskins are really tough tires for riding in very flat-prone areas, but are not good for much else.