For others with an issue similar to mine, after posting the above, I emailed the question to Lutron Support. The following response was received:
"Thank you for choosing Lutron products. We do not recommend using the LUT-MLC with the PD-6WCL." "I would suggest using the PD-5NE to get rid of the ghosting issues. Finally, all Caseta Wireless devices will still pass a small amount of current to your lighting load in the off position since they are digital controls." "The only way for it the completely shut off is by pulling the FASS. Please let me know if you have any further questions."
Phil L.
Technical Support