MENDING is the name of the game. You will also notice that the less you try and false cast a sink tip the better off you are. Load up the rod and let er rip and you get more distance. Weighted flys are not the way to go. Let the line take the fly down. As for lines, the Teeny lines cast pretty well and get down fast. No more than 4ft of leader is needed on a sink tip. Straight maxima works well.
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Clearwater/Salmon Super Freak