There's no better way than letting them season on there own. Just like a bow stave you let to wood'shoot you let it tell you when their times up.
I like to size, straighten but into bundles of 15. I leave the bark on first time. Leaving the bark on for a few months makes sure it seasons evenly. Which helps down the line with keeping your shot straight.
I Wait a couple a few months,their stored in a barn. I have no timing really when I have the time. I debark this second straightening,rasp out some of the bigger knots and kinks. Then I re straighten, re bundle. I always have 10'15 bundles right now I have 19 bundles seasoning but 3 bundles ain't mine.
Oldest are about 35 dog wood shoots that's been straighten 3 times and seasoning for 8 years. Sometimes if there extra nice I do a third straightening after a couple years.
I see arrows posted all the time. I know most are made with shoots only a couple months old.
Done this way when you do have to use them. Their already 3/4's done When you do put that findle finish on your well seasoned arrows. It's a well seasoned arrow that stays straight as long as you have it. And for you all that have to know your spines. When your finished your arrows the spine will never change.
I have arrows right now that were made 4 and 5 years back. You know dog woods tuff if I still have arrows that old. Still straight enough to shoot