i almost always (at least 90% of the time) put 0 minutes in my low potential free throw shooters as freshman. why? because the amount they will lose is very small, almost never enough to drop them from one partial grade to the next. with so much room for improvement, you can make such a bigger difference in the high potential categories.
i can also see the argument for starting at 11 to make sure you aren't near medium, where you actually might drop more than negligibly. and then, going to 0 when you get the email.
but practicing to maintain a low category doesn't make any sense to me. when capped, 0 minutes basically maintains a category. and when close, the same thing is true. so like, why not either practice 0 and use the minutes elsewhere, or put in a couple extra to make sure you are close to capped and then go to 0?
on a final note, i am very convinced in 95% of the cases all low categories for all quality freshman should be 0 minutes. anything else is wasteful. you could lose 1 point or gain 4 in a core, if not better.