To Give or Not to Give
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I have always been one that believes that if a customer wants a recipe, I'll gladly provide it to them, but then again I have spent most of my life in restaurant kitchens and not a private chef so I guess I can see why you would hesitate, but I don't think you have to worry, giving out a few recipes won't destroy your business. Just make sure that you aren't giving away your recipes to the same people. I think it is perfectly acceptable to ask a chef for a recipe or 2, but beyond that I would start to question their motives.
Beyond that though, I think you need to reconsider your use of (or lack thereof) recipes. It is fine to cook "by feel" at home but when food is your business you want to be able to provide a consistent product. If one of your clients really loves your goat cheese stuffed chicken breast you need to be able to reproduce it exactly to keep them coming back. Without that consistency it will be hard to gain the trust of clients.