Bowfishing arrows won't fly straight

Has anyone else experienced this: When I shoot my bowfishing arrows out of my slow, old compound, they won't fly straight. The arrows hit the target sideways. Did I just get some cheap arrows? I'm using one of those roller fishing arrow rests.

 

I'm using an old martin rage for my bowfishing rig. I wasn't happy using a roller style rest. Didnt like the nocking point moving up so far. I ended up using an apache drop away. I also tuned my bow to shoot regular hunting arrow bareshafts straight before shooting the heavy fishing arrow. Great results out of this rig.

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