I wouldn't worry too much about folks saying you should make it even shorter than the allotted space. We have no idea (atleast I don't) what sort of format it ends up getting printed out in and handed to the adcoms. It could be that it starts halfway down some other page of information and will span two pages no matter how long it is. Alternatively it might print in smallish font with tiny margins and will fit onto a page so long as it is less than the allotted number of characters.
Doctors have based their careers on reading, if they have volunteered to read an app I don't think an extra paragraph is going to make them decide its not worth it.