You really don't need to plunge them, they should route just deep enough to remove the copper. I was thinking of using a down-cut, it would have a cleaner cut and you wouldn't have any burs... but, just light sandpaper will take them off anyway. I guess the reason for the tapered bits is to keep the routing as narrow as possible and compensate for versions in the board not level. With a flat tip router bit you could cut the copper and barely skim the board... That is if the board is perfectly level.
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