Your rest aligns your arrow shaft to your bow and string. If it is poorly adjusted the arrow will have to overcome the initial poor flight and depending on how far you shoot and how out of tune it is the arrow may never get the chance to recover. Center shot anjustment and elevation of the rest are critical things to check. Read the paper tuning info here and maybe visit easton.com and read what they have to say and then follow up on it. The worst thing would to be to go hunting with the setup you have right now. A poorly hit deer is a mess to have on your hands and ethical hunters will do whatever they can to prevent this from happening if they can. If you are totally in the dark go pay the man at your local shop to help you. And try to ask questions about what he does to make things right and then shoot till you are ready to go out and do business. Also verify that you are using the correct shaft for your setup.

Hope you solve the issues.

Another thought. Have a look at your fletches to see if there is a contact problem. You can dust them with baby powder and shoot them and see if the powder ends up on your riser string or launcher on the rest.