Another tip is to look at your RGB settings in Illustrator or Photoshop, and look at you file in FCP under RGB rendering, because YUV will look different.
Yes, the original is on the wall in my bedroom, I also did Visions of the Emerald Beyond, Love Devotion and Surrender with Carlos Santa and a few others.
You can toss the Wav files and put the aiff files in the browser. Then tell FCP to re-connect and replace the originals with the aiff’s. There are buttons to check regarding the names of files to use, and since the new files have a different extension you have to check them.