If you are concerned with efficiency, you would be better off focusing on improving your forward stroke which will keep the boat straight without the skeg. It will also improve your speed because your effort will be going into making the boat move forward not sideways.
That tendency for your boat to veer back and forth is from turning every forward stroke into a sweep stroke. Pulling past your hip instead of exiting earlier or sweeping out at the start.
Kayak Motor Kit
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