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A sector chip does interact with the fin of the tapper plate longer than a smaller diameter post would...and in effect prolongs the portion of the firing cycle where the nozzle is retracted. The sole purpose of the nozzle being retracted is to allow a bb to feed up from a mag.
In high speed setups it's very possible for the nozzle to retract and return forward faster than the spring force of the mag can slip a bb into the feed path...so you'll get blanks.
By retracting the nozzle a bit earlier and letting it go forward a little later in the cycle enough time is created for a bb to get into the feed path
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