Hello everyone I'm messaging on here because I just bought my first bow and am in need of some help selecting my arrows. I am shooting a mathews phase 4 29 set at 65lb, 28" draw length. My current arrows are cut at 27.5 shaft only and are 400 spine. I guess my main question is what spine would you recommend for this setup. I am wanting to shoot the Easton Axis 5mm non-match grade. I have heard different things from several individuals saying get the 300's and others saying get the 340's. I would also like to run the iron will impact collars. Whether that is 10g or 25g, I wasn't sure if anyone here can attest to those as well. I am open to any suggestions but would like to stick with these arrows. Thank you so much!

-Bryce