You're more likely to spook a mature buck early in the morning the very first week. He's often back to bed by the time sun comes up anyway. They are easier to pattern on an afternoon feed pattern, because they've not been pressured at all, and will get on their feet before sunset. I hunt food sources very close to bedding only. I normally will hunt some mornings early season, but only for does, and nowhere near where I think a buck I'm hunting might be. If you don't booger them up early, you will have a good chance in the evenings. I do the same strategy every year, and its worked well for me.