I flew for 3 years before I even owned a balancer. In theory, if the engine manufacturer does their job propperly, the engine SHOULD be perfectly balanced (static & dynamic) without a prop on it. Therefore, I'll keep balancing my props.

In theory, the smaller the prop, the closer any imbalance will be to the center of rotation. The closer to center the weight is, the less impact it will have on the balance.

I feel better knowing I have taken REASONABLE measures to reduce vibration.