A possibly important piece of context which should be mentioned at this point: Fdera was lying about what the intervals between ranks are. A Count outweighs 27 Barons, a Duke outweighs 27 Counts, a Grand Duke outweighs 27 Dukes, and a Prince outweighs 27 Grands.
For those who've been keeping track of the numbers, this means that what Fdera described as the bottom of the Grand Duchess level was in fact the bottom of the Prince level, which is also the level to which Opalyn just increased her output.