That's an awful lot of money just to say you have an allison transmission. But if they can sell a kit for that kind of coin, all the power to them. I'm actually warming up to the ford 5 and 6 speed automatics but will keep my E4OD for now. It's old technology and the parts are still readily available.
If the shift map is the only complaint, then you could simply get an aftermarket controller for way less money. Turbocharging will still make a bigger improvement than anything you do with the drivetrain.