I believe they have some support for over pronation which is why you might be getting some pain wearing them.............
as well as stretching the calves check out the glutes.. weak glutes are often the reason why the calves get tight............
there are cushioned trail shoes around that won't give the stability control.......like the adidas kandia or the nike air pegasus trail ones i believe.but check out the websites of the shoes you are interested in and read the garb first