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A larger air pocket would actually be a negative for yawing since it causes the center of gravity to be father back. .
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Yes STLRN this is true: But for a bullet that retains it's shape after impact. As I mentioned, the collapsing tip serves as a braking force while the main mass of the bullet pushes from behind. The energy of the projectile wants to continue on a straight path, but now that its leading edge has drastically slowed the momentum of the bullets mass has nowhere to go but around the nose in an attempt to continue moving forward....A tumble.
If the point of the bullet remains intact the bullet will react like a nail being driven into wood; a pointed leading edge punching its way forward with its mass pushing it from behind.