If there is a flood there is often a back eddie that flows down the Vancouver Island coast to Race Rocks. We like to ride that and then cut across. It keeps you out of the Victoria - Port Angeles ferry traffic. Keep in mind that just outside the Port Angeles breakwater is where the pilots board and depart all ocean going vessels so there can be a lot of traffic around there. They're big and they're fast. If you don't have AIS have a look at this site before you leave (poor man's AIS):
YACHTMARINE - Live AIS World Ship Monitoring
Phone ahead if you need to clear customs and they'll meet you on the dock. It is on your left just as you enter the harbour (360-457-4311).
We've never encountered rollers as big as 10'-15' but I'm sure it does happen. Enjoy your day, it's one of our favorite sails.