I'm out of western Oregon, Eugene area.
are you planning to hunt east or west of Eugene? west, the deer don't migrate, it's not until you start getting into the cascades that blacktail migrate (in the general region you are talking about)
if you are hunting west of you, those deer will mainly be very home bodied, not going far their whole life, and besides the rut, will usually stick to a very small area.
spend a lot of mornings in July/early August glassing, find those bigger bucks while they are in velvet and visible and you will know you are hunting in the right spot.... doesn't mean they'll be easy to kill during season, but you know where they will live.... they will not be far during hunting season. when hunting him, keeping your presence low impact is key, then waiting for that buck to make a mistake (like being in the open during season on a rainy day, or catching him feeding first/last light)
when glassing in july, pay attention to those little pockets that stay in the shade all morning with some cover around. i have killed some really good bucks late morning in high sun bedded in cuts... they are hard to pick out, but don't write it off. the last 3 years i have killed bucks between 10-noon sunny days, in cuts where they aren't supposed to be.... very mature bucks. conventional wisdom doesn't always apply.....
find those bucks in the summer while in velvet, and build a strategy for season. knowing there are nice bucks where you are hunting helps the moral when you haven't seen a buck in several days during season.