Just to clarify, "small changes, one at a time" must still be applied to both cylinders, so it's actually "small changes, two at a time" for most things... I'd start with secondary throttle openings or just turning the O2 sensors on an off just to see how it all works. Keep saving your new maps and rename each time. Make double sure you have a backup to your backup of your starting point so you can always get back to the beginning and you will be just fine. Remember too that you can play with the software and maps from the tuneecu site without having the cable.... Have fun!