I've always found that beyond trolling at night with oversized Rap's walleye on the French demand some finesse. I've fished tons of heavy current areas on the lower french and have always done so the same way. Anchor in the current and bottom bounce with a suitable sized split shot, single hook and a worm or minnow. I always used rods in the 9' range when doing that - stuff I typically use bottom bouncing for steelhead. Small spinning reel loaded with 6lb test and away you go. Quarter cast upstream, allow the bait to sink ticking the bottom, then as it swings below you open the bail up and feed out line keeping in contact with the bottom. Sometime the hits are incredibly soft for such big fish - you really need to have a bit of a touch at times as they'll often play with the bait for a while. I've caught plenty of giants up to 10lb's fishing like that on the French.
Typically on more remote less pressured water I never fish this way. Further north a heavy jig/twister combo will catch lots drifted in the current.