Flow in a 36 gallon bow front reef

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I have a 36 gallon tank, I'm going to be housing mainly SPS in it. I have a mag 7 return with close to 5 ft of head and a jebao rw4. The rw4 isn't kicking up enough detritus so I want to add another powerhead.

In your opinion, should I get another rw4 or add an rw8?

Also,suggestions on placement?

Return is top left. Don't mind the mag 3, I was stirring up detritus and catching it with a filter sock.

 

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Bump. I'm leaning towards an rw8 since I can always set it to less flow if needed...