I just picked up my new Mathews VXR and its time for me to get an arrow set up for deer and elk. With my old bow I shot the Easton Axis 340 spine arrow cut at 29.25 excluding nock. I only have 4 arrows left so if I'm going to change things up now is the time. My draw length is 28.5 and weight is 65lb. I shoot 100gr fixed heads. With my current arrow I think the total weight should be around 422 gr. I'm thinking I may need more weight for elk. Do I add weight with a brass insert or the half out and if I do should I go with a 300 spine? The 300 is 10.7 gr and 340 is 9.5 gr. Thanks for your help