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Hop up is there to combat the forces of gravity pulling perpendicular to the flight path. If you're shooting straight down, you're shooting in the same direction as gravitational force, and thus, hop up will pull the BB perpendicular to the shot vector. With no gravitational force to keep the BB down, the projectile will not fly straight, when you are shooting downwards towards the ground.
In this scenario, you should consider a non-hop up system.
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