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Many paddlers tape pads into their ski's buckets. A pad can help create a better angle and therefore more leverage at the catch, as well as provide comfort. See Padding in Equipment Adjustment
You may set your foot braces for different conditions. In big waves, you might want to set your braces long so you can get your weight lower in the ski for added stability. In flatwater, you may like to shorten your braces so you can exert more torque.
In general, paddle length depends on torso length when sitting in your boat. At the catch, with the blade fully submerged, you want your upper hand at about forehead height. Get a friend to watch you and help you adjust your length. As a more advanced technique after you have a solid stroke and catch, you can also change your paddle length mid-run. If you are getting tired, shorten the paddle. If you are feeling strong, lengthen the paddle. Paddlers who do this practice to make it as quick and foolproof as possible. You may want to experiment with marks on your paddle that you can see more easily.
The number of degrees to which you set your feather is personal. Some prefer no feather at all. The advantages of no feathering include making it easier to brace on both sides, and possibly reducing strain on your wrists (some report the opposite to be true). One disadvantage of no feather is wind resistance on the blade going up-wind.