[Purged]* I have seen this style with a lot of former recreational canoeist. They are more long distance, less strenuous type of paddling in comparison to iron OC-6 competitors and sprint dragon boaters. Unfortunately, this does style does not maximize power and efficiency; however, it does allow the body to move in a regular, circular movement. The people who use this style with me were usually grand-master level not interested in making great distances in the practice.
1.Lose the high top arm no power will result from this .
Super high top hand (above your head) is great if you want to spear the water. Low top hand (forehead level) angles out the blade further forward for a longer stroke.
6.Exit should be a full D stroke with the blade brought up very high and top arm dropping low in the boat.
Yes, you want the blade to skim the water in the recovery. The recovery should be slow, as you are in a long distance race, not a sprint, and you want to take advantage of the glide. The blade is brought high in case of big waves. No, you still want to use the least amount of strength, so you don't want it so high that it takes energy to lift the blade. Also you don't want to drop the top arm low as it take energy to bring it back high again for the pre-catch. A trick would be to use the top hand to twist the blade, so the blade feathers the water (and cuts through those pesky rogue waves).
As for everything else (2-5), I totally disagree with. With myself, I could last 90 seconds with arms, longer with lats, but it is the core that keeps you going. You need the good catch or else you are pulling air. You need leg drive as it is part of the core (total body motion). You need to lean to get a further reach.
If you want to see an example, try this (without jumping out of the boat

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*Apologies to Colossus, I didn't read the first line of his response: first off i'll say this: different strokes for different folks. what works for some people might not necessarily work for others.