1. Make sure you have the right arrow shafts.
2. Adjust your rest. Hitting low move your rest up. Shooting left move your rest right. Just centering the rest often does not work.
3. 1000s of people shoot just fine with a whisker biscuit. I shoot a rip cord drop away and like it better but a whisker biscuit will work just fine and has for many years.
4. you should probably get a new string and cables.