First try running the tyres at slightly lower pressures. Try cold pressures of 32PSI all round. Still not good enough, then fit a set of softer compound all weather tyres. Michelin Cross Climate are best, but may not do the size. Next, Goodyear Vector 4-Seasons Gen 2. After that, Nokian Weatherproof, Vredestein Quatrac, Bridgestone A001s, Pirelli Scorpion Verde.