A few minor tweaks and you should see some improvement. I would move them both to the back glass outside edges), pointing slightly toward the middle. The right one below the overflow pointing a little up, and the left one at the same level pointed to create turbulence on the surface. You may still have some low flow areas that (depending on where corals and rock are placed) and those may need some occasional sand stirring or attention at water change time but such is life.
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