I am not sure of the details of your build but from what you have stated we are at least similar. Here is a path to two of my files a1(ORIGINAL).gct is the original fuel mapping that the engine came with. d1.gct is what I am currently running.
They are located here
Index of /rwillia4/Public/XFI
Save them into this folder C:\CComWP XFI\GCT (which is the default FAST folder)
Open your "CComp WP - XFI" program and connect to your FAST XFI
DOWNLOAD AND SAVE your original file
Upload and test the two files to see which works better on your car.
You will love it once you get it dialed in!!!