Thank you everyone for the input. I'm fishing out of an 18' square stern freighter canoe. When I have a client up front I can paddle the boat away from structure. When I'm on my own, I can only do so much without a trolling motor. The rod in the water trick is something I will try to do more consciously. In the deep lakes I fish, they often hit on the edge of a drop off and head straight for bottom once you get them to the boat.
@BassB8Caster I am in coastal/central Maine. My line is replaced once or twice a season. I check for nicks often and I'm confident with my knots--the line looks frayed after breaking one off. I'm afraid of using braid because I fish lots of rocks. Maybe mono or 12lb fluoro is the way to go. I have no idea how big these are without getting a scale on them. I just know that they are big.
@A-Jay and @J Francho a plan sounds nice, but it's hard to know when you will hook a big one, unless they are on a bed or are cruising an area. Still, it's a good idea and I will do my best to try to stay aware of potential hazards. Thanks.
So it sounds like I need to size up. Why go to a bait caster? Why do so many people fish them? I don't really get it. I think 12lb fluoro and a medium heavy rod may help me. I'm not sure if I should go spinning or bait casting. More ideas?