Thanks for sharing the project, and well done for getting the result you wanted.
The “right” way to control spacing, once you understand the controls, is faster, more convenient and more powerful. Pushing staves around by hand this way, you are working against Dorico’s automatic collision avoidance, for one thing.
@dan_kreider was posting about a hymn slides project just last week. From that, he has more experience producing slides from Dorico than I.