That apparent dryness is normal, and would happen anywhere. My Speed 4s look like this after just 100km, there is no effect on the shoe's feel. Maybe you are over striding slightly? Although I believe I front / mid foot strike, I do something heal strike on long runs - depending on gradient - and I don't really feel it. I am not a coach or trainer, and I am definately not suggesting you change style (I am not qualified), but maybe ask a coach or video yourself running in slow mo or speak to a coach or physio? I have used a few Saucony trainers with that tread pattern on trails, and they were fine unless wet. On ice I put on an outer with spikes (I don't know the English word for them). The ones I use only really fit shoes with a stack height under 40.
