Little more update, the problem seems to follow the actual adjustable pipe/intake. However I did dial down the flow a bit as anything over 1/2 on the ball valve just causes nothing but surge so I'm not 100% sure that is true. At about 1/2 (Throttling right after pump) one Is dead quiet and the other one isn't bad if I stick a hose in it. What I don't get is the water level on the louder one is a bit lower when using the actual 180 degree intake bend as a reference (tank is level). Despite the height of that intake pvc
the water level "should" be at the same height on the pipe on both overflows I would assume. It's a good inch lower on the loud side. TO me this indicates one drain is more efficient than the other and the water is exiting the intake tube faster thus not causing backup and water level increase. I did try to increase flow to test this theory though and it did not rise the water level on that side. Can anyone think of any reason the water level on one overflow would be lower.
I've added a pic for reference to what I'm referring to.