Hooknose,
Are you checking the Kwikfish to make sure that they are runnin true and diving straight. I attended a seminar given by Dan Ross he said check it static, then pull slowly through the water, then pull it swiftly through the water, if it pulls straight and passes all three of these tests it is tuned properly. If you wrap it you'll need to check it over again. He also said that tuned Kfish will outperform untuned Kfish at least 5 to 1. I agree with the other guys a K15 will dive 8 - 10 ft. on its own depending on the current, you might be burrowing it in with dropper. You might also go to the ifish page and look at the old discussion board, RT has posted some good plug tips there. Hope this helps.
Tight lines, Jeff