With today's arrow technology there is absolutely no reason to even look at an overdraw anymore.......they are a thing of the past and irrelevant today.
If you would like more speed and have enough money to purchase an overdraw that money would be far better spent on a new doz arrows that are a little lighter but still properly spined for your set up.

Not to mention that placing the tip of the arrow significantly behind the pivot point of the gripwill magnify anytorque reducing potential accuracy as well as raising the danger level at the same time.
A longer arrow is generally a more stable arrow as well.
For the utmost in accuracy I try to keep the contact point of the arrow/ rest directly above the throat of the grip.