So you cutting down the number of levels for both nightclub and security office?
From context I guess 6 nights total?
I suppose that will make the difficulty scale a bit harder than the current ones, but WILL remove a good amount of 'no new gameplay elements just get harder' levels in between.
Don't know if you have changed it yet but personaly introducing something new every 2 levels would feel like a sweet spot. 1 level to introduce it and one to used to it before something new is thrown in.
Anyway will wait to see how it is changed.