SW is a large area, as it includes all the SW units. Just to the north of where you're heading, the Siuslaw unit has the highest % success on spring bear for all the units on the SW spring bear tag. But where you're going to Coos Bay area the Sixes and Tioga units are also productive. Good luck.
I drew Minam-Imnaha up in the NE this year, so won't be heading out for spring bear until May as need the snow to melt more up there. Focused on turkey next week for the opener.
Good luck on your hunt. Definitely head south of Coos Bay the 20 or so miles down to Bandon if you get free time. I love Bandon. Great little town. I go crabbing in the river there just in from the jetty.