A bow has dual phase recoil. When the string, arrow and limbs begin moving forward, the handle is pushed rearward, into the hand. " For every action, there is an equal and opposite reaction." Then, when the limbs and string return to brace, the limbs stop but retain their forward momentum. That' s what makes the second recoil phase where the handle jumps forward.

That' s the theory behind parallel limb technology. Make the limbs move up and down rather than back and forth. Each limb works to cancel out the recoil of the other limb and there is less forward momentum transferred to the handle.

An extra 100 grains of arrow weight is relatively insignificant compared to the weight of the bow. (A bow with all accessories weighing 5 pounds is equal to 35,000 grains) The extra 100 grains of weight will absorb more energy into the arrow and leave less in the bow. Less energy in the bow, the less momentum is created. The less momentum, the less recoil.

It' s really pretty simple, if you think about it.