Light cab with high unit spacing issues

I've noticed that cav units with high unit spacing have serious movement issues.

ex: aorsi riders unable to move cleanly to a spot on the battlefield or effectively chase routing units.

Has anyone else encountered this problem? Is it related to unit spacing? Unit models? Is it considered a bad g or a feature?

thanks!

Edit: I know the title is misspelled, can't change, autocorrect does not like the abbreviation "cav"