Doesn't anyone remember their High School Physics class when they talked about inertia and centrifugal and centripital forces?
The higher the mass of an airplane, the more resistant it will be to forces trying to change its attitude or direction but once it is changed the farther it will go from its' stable state.

It takes more force to move a heavier airplane than a light one, simply put, hence the better it handles wind. All these formulas and stuff are great for theoretical discussions but the factor that most effects airplane stability is its weight.
Now before you all go off on me, read that carefully. That statement works in both directions.