Kastmasters are one of my favorite lures too. One the best ways I have found to use them is from the bank, where there is a good drop off close in. I cast way out as far as I can and let it sink to the bottom then I start jigging it back in. Jig up and real down. You want to real in on the down stroke just enough to keep slack out of the line but not so much that your not allowing the lure to flutter down as it sinks a bit. Repeat this until it's back in and do it again. This is a great way to target kokanee when you don't have a boat. I like green or blue and silver.
Cheers,
Nate