Actually decks awash is part of the stock game, you just have no real control over it. When you leave port your sub is "surfaced", and once you dive and re-surface the interface states you are "decks awash" when you hover over your sub.
I believe the issue could lay in the fact the mod changes the behaviour of decks awash making it slightly deeper thereby making the uzo etc vanish due to a hard coded depth value for instrumentation on the bridge deck.
Frankly I find the uzo to be detrimental to a surface attack with all its bouncing up and down and its limited view. The only solution I can think of in gameplay terms is to use a periscope instead of the uzo. Its more stable and has a better field of view.
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