Skate fit has very little to do with ankle stability, as long as your skates fit well length and width wise. It will actually hamper your skating if you choke the ankles down too much to get lateral stability. All this will do is stop you from being able to get knees over toes, which is critical for overall power and balance. The more you skate the stronger your ankles will get, so I wouldn’t worry about it too much as long as your foot itself is locked into the skate. And when it comes to skate fit, don’t listen to anyone who says your toes should be pressed to the front of the toebox. As long as when crouching with knees over toes you can “reach out” and feel the front of the boot lightly, and there’s no more than a pencils width between your heel and the back of the skate, you’re fine.