Chance to Hide = (HiS + MS) /2 . This value is checked when you try to hide, and - I believe - once each round you continue to hide. You want this value as high as possible.
Move silently gives bonuses after you leave the shadows. In particular, it increases the delay between when you leave the shadows and when you become visible.
Hide in Shadows does nothing extra for you.
So, forget that Hide in Shadows exists. Put all your points into Move Silently.
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