hey Saltspringer
I suspect nobody responded to your post because, with all due respects, your questions is a bit like asking what is the best time of the day to catch a salmon. It depends.
I did the trip from Pt. Alberni to Bamfield and back again in June. I was warned by a guy who lives in Bamfield to do the trip early morning, both coming and going, because early morning is the most consistent time of the day to have glassy running conditions. He was right.
The evening I rolled in to Port Alberni (about 5 PM) the wind was absolutely howling. I saw one of those big orange amphibious planes trying to land in the Inlet and it was literally hanging suspended in mid flight fighting that wind. I decided to stay at a campground that night. The run to Bamfield the next morning was a piece of cake.
If you have an offshore blow in the afternoon combined with heat convection, Alberni Inlet is the nozzle where it will all gets squirted through. So.....
If you wanted to work out the statistical probabilities of what time of the day to run the Inlet with the best weather conditions, my guess is early morning would trump the afternoon because the heat convection part of the equation is minimized.
If I'm all wet on this one, someone please chime in. Otherwise, good luck