I am just starting out with archery. I am preparing to be able to archery hunt deer next season. Can I use the same arrows for both bows. My draw length is 25". I have the following: - Blackout Intrigue Compound (New) set at 43# for my 25" Draw using a Whisker Biscuit rest and - Martin Jaguar (used / new string) @ 28" #40, 60", using a arrow rest similar to "Saunders Archery Express Rest". I tested the draw using a scale @25" draw, I got 34# The Martin came with Gold Tip Expedition 5575 arrows @ 31"; as near as I can figure, these have a .400 spine. Can I use these arrows with both bows for practice purposes? I cut one arrow down to 27" just to see how it feels. From what I understand this would change the spine "stiffness". Is there a way to figure the spine strength / stiffness when an arrow is shortened?