RE: question about arrow length
according to easton 27 1/4 " . Really it can be between 28 and 27 inches and still be good as far as most spine charts go. It depends on rest set up and riser configuration mostly. The charts don't ask for your draw length so you need to be pretty close with the arrow length, or adjust for it when using the chart. There is no reason you can't shoot a longer or shorter arrow, it's just harder to choose the correct arrow, especially with a longer arrow.
Look at easons tuning guide, lots of info there.
Paul