Are you using a diffusor or a reactor?
If you are using a diffusor, you need to remove the rainbar and point the point of the out let at the diffusor to encourage the co2 to spread evenly, or you can place the diffusor under the point.
for a reactor, the you have to turn up the power cos then there will not have any dead spot. and you have to place the rain bar for best co2 spreading.
but must see how big is your tank. for what i know, shrimps need gentle flow water, it mostly stay on the bottom of the tank. i think you can use a diffusor vis a point outlet. cos only the surface of the water will move and the bottom will have minimum movement.

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