I have backpacked the MSW extensively and have hunted the high hunt there as well. It is beautiful and rugged country but to be honest the deer populations are very low. There are some pockets of deer here and there. I've found that the deer simply prefer the food sources within managed timberlands over the wilderness. The only shooter bucks I've found have been in nasty hell holes not served by any trails (of which there are very few anyhow in the MSW). Think lots of bushwhacking and tarzan style climbs using vine maple and devils club.
I "guided" a friend this year on a Mountain Goat OIL hunt in the unit and spent 6 days scouting and didn't see one piece of deer sign in the unit. I'm not saying that to discourage you and keep you out of the unit...just providing some perspective.
The high hunt in any of the Olympic Wilderness Areas is a lot of fun but I always keep my expectations focused on enjoying a great backcountry camping experience. Any deer sightings are a bonus. Any deer killed is a trophy.