Okay, I want to post my final resolution in case it can help someone in the future.

The IAT was high and the MAF values were high at 1.09, so I took a chance on the MAF and it solved the problem. The car is now a rocket ship and the LTFT has come back down.

This car was low mileage, well cared for and always garaged. I have been looking for a stick shift V6 car for a very long time, so when I found this car I bought it perfectly willing to sort through the power problem. My gamble has paid off and I am absolutely tickled to death to have this car. Thanks for all the replies.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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