Maybe you should list the details of your setup. Bow weight and draw length. Arrow type, spine, length, tip weight and type of fletching. It's possible your arrows are underspined or maybe not enough tip weight (FOC) to pull the arrow along.

There are a multitude of things, but you probably need to start right from scratch. Set up the bow properly for tiller, centershot, nocking point height...... Problems can be caused by a conglomeration of things. You have to pay attention to every detail starting with the basics.