If it actually happened at about 60' and the plane was over-weight it would have taken a really skilled pilot to save it.

One thing I learned the hard way is that balancing a model by putting weight at the extremes is bad news. Imagine that you're holding a 2 x 2 about 6 feet long. Hold it so it balances in your hand. From that point use your wrist to rotate it. Now try to stop it. It doesn't stop instantly does it?

now imagine that you put a pound of weight on one end and a half pound at the other. Find where it balances and rotate it with your wrist. It takes a lot more effort to get it started and to stop it. Even though it "balances" there is a lot of inertia that does bad things.

Airplanes are exactly the same. If the extremes (nose, tail, wing tips) are heavy then it will be hard to stop it from rotating once it starts.

That being said, you should always balance your model but if you have to add weight to do it then know that you're adding bad inertia.