Try the Quadzilla M3 Max Mileage first.. it will do timing and boost fooling for your truck. IF you aren't happy with the performance, pay a little extra and you can upgrade it to the XZT+ (does timing, boost fooling, and adds a little extra fuel) software via a download off their website, and choose the power increase you desire.
It comes with 3 position switch: off, on, off.
Once upgraded it will be just like the XZT+ : off, economy, hp tune
I got it and love it, and I have yet to feel the need for the upgrade doing the same thing you are. Just my .02