The boost mode definitely feels like more power than turbo. I don’t know the exact power but it’s plenty. It’s like pushing the nitro button in a video game. Even a bit scary if you have tech in front of you. Regardless what the power level boost actually is (1300-1500), I think folks will be pleased once they get it working.
My understanding is that boost is basically max everything available with the current configuration. The custom setting goes to up to 1300w/130nm so I don't know what boost is offering beyond that.
What do you have your turbo mode set at?
If it's maxed out like in this screenshot do you still feel anything extra when you hit the button?