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I've still not used them, but as far as I know, that 18-16º angle represents the point where your power production should be higher, and the dead spot should be then correctly located in the narrowest diameter of the chainring. So they offer you 5 positions to "find it" (or get near to it) in the outer ring, and 2 in the inner ring.
What I mean, is that the dead spot is not supposed to be at the 12 o'clock always, it depends of the position of the saddle in regard to the bottom bracket (think about a Time Trial bike and a normal road bike... saddle is way more forward in the TT).
Anyway... all my knowledge is based on internet reading :), don't take it as a fact.
bertocq
Yep i've got this.
But what's the main difference between a 18° and a 16° angle ? In which case are you spinning faster?