Finger shooters will always experience plucking in varying degrees. Even the very best do it a little bit. If an arrow is crooked it will shoot crooked. To check your arrows hold them in the middle and, looking down the shaft, turn the arrow by the nock. If the point wiggles the arrow is bent.
Crooked arrows are always a possibility with aluminum arrows.
Carbon arrows are always straight. A properly set up bow should propel arrows perfectly straight, they shouldn't wobble or porpoise even a little bit. If the arrow flops left or right, or up and down to any noticeable degree it doesn't have to be like that. Another clue is if your arrows are going in the target crooked. That is bad, because it will definitely reduce penetration.