I came across a site once, maybe it was bujin That suggested tying your hakama according to your waist. Mid section size should determine what you are doing with your straps according to the article.
I pull them(the starps) as tight as I can after each pass. Only because I learned that the straps come loose after a few rolls. Also I found that lacing my straps over my obi straps tended to keep the hakama where it belonged. Often I bound it as to conceal the color of my belt. Increasing my chances for being called up by visiting teachers