The way I got myself to stop catching my jawline with a straight was to shave away from the mirror, just returning to check work ... without the eyes, the connection between fingers (so, angle), blade and skin becomes so much more ... well, connected.
I do exactly as you describe with my DE under the nose. I noticed when I looked in the mirror and relied on sight only to judge where the blade was, I tended to nick; however, now that I look away and shave by "feel" only, the nicks have become a thing of the past.
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