Silencing beananimal overflow

[dpg]

Hello
I have an external overflow the height of my tank with a beananimal style overflow. Tank is located on the main floor and drains via many feet of horizontal and vertical runs into a basement sump. All pvc pipe diameter, drain and return, is 1.5".
It's fairly noisy and the only way to quiet it down was to dial back the return pump significantly. Would this negate the purpose of returning cleaned water to the display because the return is so low - returns are located by the overflow.

I don't believe that it's running as a true beananimal due to the long runs and maybe the height of the overflow. Would shortening the overflow maybe help? Any other thoughts and advice are appreciated.