Is it possible to upload a tune from the predator and make changes on my computer then download it back to my car? I can download the tune from the predator but can not edit the tune.

I have a 99 mustang with a vortec supercharger and a aftercooler system. I'm having problems running lean. I purchased a U7146 and have played with it quiet a bit. I've noticed that the spark advance and fuel adjustments are all WOT. Is there any adjustments I can make to get this thing in the ...