I don't think you will find the answer to your last question in the yellow book. You will find it in basic physics and mechanics. It is about conservation of energy. Energy is redistributed from your body to the clubhead during the release. Everything but the club will be slowed down by this redistribution. The moving mass of your body is where the energy comes from.
Unless you hold back prior to the release there's no chance that you will be able to thrust and pull hard enough to fully neutralize the slow down effect during the release interval. But keep trying, because the more effort you put in the more speed you will get out of the release. But if you make hand speed your top priority you may end up with a swing without a proper release.
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