Automator Newbie question
You can run a Terminal command to batch edit the extensions and move the files to the processed folder:


  cd /path/to/folder


where /path/to/folder is the folder containing the originals. 


  for file in *.tiff; do cp "$file" "${file%tiff}tif"; mv *.tif ~/Desktop/Processed; done


This command will leave the originals in the original folder, and move the "processed (tif)" files to the "Processed" folder. The script is a bit sloppy regarding syntax, but would easily get the job done. I don't know how to automate unchecking "Alpha."

Note that you can incorporate Shell commands into an Automator routine as well, under Library > Utilities > Run Shell Script.