The canted position is usually the kneeling position. You don't say why you can't kneel. Is it the height of the seat or that your knees hurt? The more you practice kneeling, usually, the more you get used to it and the less it hurts.
The flat position would usually be the sitting position. An experienced seated paddler in a bucket seat might want a slight cant, and would also probably also want a foot bar to press against. Maybe a foot bar would help you.
More generally, does your lower back hurt when you sit in other seats than the Wenonah canoe seat? If so, perhaps some back muscle strengthening exercises would help. If you've been overweight for a long time and dieting aggressively without weight training, you may have several weakened muscle groups.
Hard for anyone to predict whether a backrest will help you, but it's a cheap investment to try, especially if you buy it from somewhere with a good return policy.
YakCatcher Rod Holder
4-place Boat Trailer
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