On these new blown mustangs you can swap out the lower crank hub for more boost, and not even need to retune it because they have enough injector to support more power
I'm positive that they sold you a 2.3 TVS that makes over 700 to the wheels, if you want nasty, put long tubes, methanol, retune it and make what ever power you feel comfy at
Have you had the chance to race at the track as is? Race a hellcat yet?
My non blown mustang kicks ZL1s to the curb.
The mustang does have that weight advantage, so possibly you have a hellcat killer and just don't know it
Make sure you race a stock one
Did you buy the ford racing rear half shafts yet?