Spot and stalk hunting with any rain gear, is going to test the tolerance of too much mositure on one side or the other. Pretty soon you work up a sweat and have to stop and cool off before moving on. I try to layer with polyester or other wicking base layers, so I do not get damp and then cold inside.
Sometimes it is easier to wear water proof leg chaps, which come in light, medium or heavy weight (Cabelas sells to upland bird hunters), and a longer Gore Tex jacket. This way the legs and thighs stay dry, and you are ventiated under the rain jacket.