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I have no experience working on revolvers,
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No instructions come with new springs, so the first step is probably to learn enough to understand how the revolver works and try simple things first. Changing a mainspring ona K frame can be done just by removing the grips, but first you need to check that the strain screw is original and fully tightened. The Jerry Kuhnhausen "The S&W Revolver Shop Manual" is an excellent book.
Most people put in a Wolff reduced mainspring to REDUCE the trigger pull, and some cut or loosen the strain screw. These actions can cause light strikes, especially with some primers.
My IDPA revolver has the strutted reduced mainspring and requires that I use Federal primers. The double action trigger pull is about 7#.
It sounds like what you need is a stock S&W spring and a stock S&W strain screw to insure 100% reliability with your CCI primers. Or, it is possible you have a firing pin problem.