It is definitely too much. I have an issue with Unity because if you set it at what would be a reasonable amount it's super slow in the engine and hard to play. Then I forgot to change it before I submitted the game ;-;
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I can understand that, I don't know if this will be helpful but I find "Conditional Compilation" statements useful when I need code to only run on certain platforms. So you could ensure that mouse sensitivity is X value in editor every time, and then whatever is in that IF statement will be disregarded on other platforms, it's been very hand for me - https://docs.unity3d.com/Manual/PlatformDependentCompilation.html