After nearly 10 years on the agent side and now being a carrier rep, I can attest this is the way to hit your production and commission goals. Here is a strategy I encourage you institute at your shop:

Lie to yourself and tell yourself that working for your high maintenance client is a pleasurable experience. (What you are forced to learn increases your value as an agent.) Lie to yourself and tell your brain that your inaccessible, unknowledgeable sales rep is an asset to your agency. (What you are forced to do yourself makes you less dependent on someone else for your success.)

Lie to yourself and say that waiting on hold for the customer service department of a carrier is good time management. (Use this time to check your e-mails that are piling up.) Lie to your competition and tell them it doesn't pay to go after the high maintenance clients (that forces you to learn more about your craft and thus sharpens your skills for the next challenging case that you are now better equipped than your competition to handle.)