You can run the same amount of boost on an alcohol injection kit as you can on race gas. Timing may/will be different.
And it is possible depending on turbo, IC, and mods to engine.. you may end up getting better performance on alky than race gas. Cars with small turbos, stock IC's, etc.. those will be faster on alky than race gas. Proven.
They both add octane. Alky adds cooling as a side benefit.
But.... it also adds another dimension to the tuning.
Being Boost, Fuel, Spark are the three... add alcohol.. thats 4.
The downside, having another tank to fill, and another component in the car to look after. The upside... once you try it.. you'll never go back.
HTH