Things could go great either way, or be terrible either way, really hard to predict the conditions. But generally you are much better off launching at Clutesi Haven and running out to Bamfield. It's about 1 hr 30 min.
Last year we had our boat and trailer at Poett Nook and the road conditions were different each trip out there. The drive to Bamfield towing a boat could vary from 2 hrs in great conditions to 4 hrs plus...
Yes, low tide at Clutesi can be interesting, just watch the green marker across from the launch and if it's laying down in the water take it easy. But it's not that much of a problem. 2 years ago before we started staying at Poett Nook we ran the boat out to Bamfield over a dozen times. Never had a problem, watch for stuff in the water, and enjoy the nice ride. Best time to go is in the morning before the wind gets going in Nahmint.
Have Fun!
BT