i just bought some new arrows,they are fletched with a helicle. my old arrows were straight fletched,when i was shooting yesterday and 2day the helicled arrows wouldnt hit the same spot twice so i started shooting the straight fletched arrows i hit the bullseye everytime , QUESTION 1 WHY DONT THE SHOOT THE SAME THERE THE SAME ARROWS ,QUESTION 2 DOES HAVING A HELICLE MAKE YOUR ARROW LOSE SPEED ,AND QUESTION 3 WHAT WAY DO YOU PREFER AND ANY MORE INPUT WOULD BE USEFUL THANKS