I too will be taking my boat to Vancouver from Long Harbour, Saltspring Island next week. I do this frequently. I go Active if time is an issue, as it is 3 miles shorter than going through Porlier (for me, but for you it will be more than 4 miles shorter). I will go Porlier if the tide is against me through Active, as Porlier is a much shorter pass, so less time lost to adverse current. My boat will behave just about as well in the quartering head or following sea on the Porlier run, as it does with the sea right aft or on the nose on the Active run. Pay attention to the ocean bouy reports from Entrance Island and Sand Heads, as they will tell you what is actually happening in Georgia Strait, near Nanaimo and out in the middle. The forecasts are less useful, as they predict what will be the worst conditions in the forecast area, before the next revision. Where we are going will never get those conditions unless there is a full gale blowing, and you won't be out there.
I am planning to leave Long Harbour by 10 AM, on Nov 4th, and travel at 8 knots, so will be exiting Active Pass at 11:30, or Porlier at 12:45 My boat name is Retreat. Call me if you are out at the same time.