Try rolling them on a glass top table,or flat surface, mark the end where the high spot is so you can check later after straightening.
If you have nice wood without a lot of runout, use a screw drive metal shaft and stroke the high spot, light pressure compresses the wood and it will stay straight longer. If there is runout, too much pressure will pop the ends loose. You may still have to do some a second time until you get use to the technique.
Wipe, or dip a clearcoat of Mini Wax Wipe on Poly, or whatever you like and get the ends. I feel it is important to do this if you live where it is humid, or rains. Especially if you are taking your time in finishing the arrows.