Preferred Custom Tuners

I have an SCT X-4 device with 3 custom tunes I had on my 13 5.0 F150, i contacted the writer of the custom tunes and he responded that he doesn't have the ability to do 17 mustangs yet. So now I'm in the market for a reputable custom tuner that works with the SCT X-4 devices.

Any thoughts, or recommendations?