You don't need to go to the bank unless you want other fish.
40-90 fathoms maybe half way out to the US line. The seine boats used to line up a half mile apart, every 5 fathoms and all set together. So 35, 40, 45, etc... all the way out to 120 or so. Then they would watch with binoculars and get in line at the depth where the most fish were being caught. 70 fathoms was a favourite depth for many boats on the blue line back in the day. The blue line was/is between Carmanah and the tip of the American side if memory serves. The depth of the water compared to the distance from shore at the blue line differs from straight out from Renfrew. I can't remember if it's deeper or shallower closer to Renfrew. Maybe go perpendicular to shore until you find them then go parallel. Watch for jumpers. There should be a test boat out there somewhere. If there's an opening, get well outside the blue line rather than behind the nets in the deader water. I don't know how many boats would be there. It used to be hundreds. Gillnetters come out at night like zombies.