In answer to your final question, essentially "yes". Once flow is balanced, it will remain reasonably balanced through a range of flow rates. If flow drops to a fraction of original or quadruples, then things may get out of proportion.
The whole concept of flow resistance is not entirely intuitive. Resistance is not merely linear with flow area, for example. Geometries with equal area, but different shape (eg circle vs square) will have different flow qualities. Even for a given geometry (say circular) flow resistance is not linear with area.
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