Thank you for the file, @dascott . I am not sure what you were after, as, in that fast tempo the fine adjustments that you made don’t seem to be perceivable anyway.
There are, instead, some removed rests that cause the rhythmic problem (and you probably had forgotten that there was those hidden rests and tried to compensate the playback position with playback overrides).
Here below a short video. Also, if you will put the fast notes as grace notes, Dorico handles them automatically, just put the grace notes before the barline (in the properties panel). If you want to ged rid of the playback offsets, select all the notes, and in Play menu choose Reset Playback Overrides: