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In my opinion, adding small blind spot mirrors to your existing sideview mirrors is the way to go (make sure to get high quality ones). This in ensures you have no blind spots, even if your adjustment is slightly off. I'm surprised industry hasn't just required such mirrors to be part of the original manufacturer's design....this would eliminate all blind spots.

On a side note, most peformance driving schools will tell you to adjust your sideview mirrors slightly wider than what you show in your 'normal' view. This helps eliminate the blind spot where the car is just shy of your peripheral vision.