Coast to coast overflow hampers wave?

[banditpowdercoat]

So I've been playing with my WP-25's on my 150. Have one at either either end. Got a not bad wave, or so I thought. Today, doing some spot feeding and such, Sump return off, so the water level in DT down below the coast to coast overflow. And now I am getting like double the wave size. And seems more sway in tank. Wondering if I should block some of the overflow off??? Maybe make it in 3 sections or I dunno, just be happy with the littler wave LOL