As you should know, the Academy Admissions website states that the max distance for the throw is 66', the goal is 42', & "below average performance may be disqualifying". What do these facts mean to you? The word minimum isn't used anywhere because they don't publish those #'s; (something you would have found out if you did the research) only the above info is given so you have to interpret it. I interpret the info to mean you need 12 more feet & you'll be at the goal distance. Since as you say you're "solid on every other event" & "it's only been about a month", keep practicing the throw & in another month, see where you are. Technique & core strength.
"It's supposed to be hard. If it wasn't hard, everyone would do it. "
-- Jimmy Dugan, "A League of Their Own"