How could I improve this?
Try ‘keep sharp edges’ at like 5 degrees or less.
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I think you may have missed his question. I could be wrong, but I believe he is trying to use the Front Facing Vertex only option to select an area. However, when he does it, it’s selecting an area it shouldn’t be. That why he flips the object at the end- to show this.
But I also learned a new trick so thank you for your reply 
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Either a bug or … do you have symmetry on?
Check symmetry yes, but in that case it’s likely bug with non uniform scale and skew, I’ll fix it.
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Nice one!