No matter what anyone says, You can use any gravity you'd like if you know how to use it. Some awesome replay makers like to make replays in -9.82, -30, -15, etc.
Usually higher gravities, are used for realism, and tricking, while gravities such as -9.82, -7.00, 10.00, are commonly used for Madmans, Decaps, and other kinds of replays. So if your style is easier to do in -25.00, use it, and its all about finding the right gravities that suit your replays.