I'd not have an issue with them being a bit taller or shorter than the slider, so long as you do hit the cap on the slider's direction. Saying your 2 inches above max and having the slider to shortest is silly.
That said, if you want to make them a good several feet above or below the height that is normal for their genetics, I'd not be able to take it as seriously.
That said, if you want to make them a good several feet above or below the height that is normal for their genetics, I'd not be able to take it as seriously.