Once allied air cover becomes a problem I run full or flank diesels on the surface when I'm doing battery charging runs so that when the plane does appear, and it will if your cruising across the Biscay, I have a fairly decent chance at crash diving and getting deep enough so that the bombs do minimal damage.
As for the radar detectors, I don't put much stock in those, and I prefer to do batter charge runs during the extremely early morning hours or late at night so my watch crew gets the benefit of some twilight to see incoming enemy planes as soon as the radar detector picks them up, so that I can get a fast start on a crash dive.
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