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I don't have the anti radar coating yet so it's reasonable to guess they are discovering it through that means.
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The anti-radar coating is only partially useful, though this may well be realistic. Much better are the snorkel mounted RWRs.
Absent the above you can only minimize head exposure above water by ordering snorkel depth or adjusting it manually.
Generally speaking a Type VII forced to operate like a true submarine will be slow so the focus was put on attacking shipping in british home waters. A XXI can cruise a 5-6 knots all day so you have more reach but crossing the Atlantic will be a very tedious affair.
Eventually in real life an electrically controlled T-valve snorkel with much smaller profile would have been issued but only some Type IID had them installed before the end of the war.