is there a trick to matching return flow on a herbie?

[Dez]

I have a wavebox and overflow on the same side like yours. I have no standpipe on the main drain and a full length standpipe on the emergency drain. It wasn't bad to adjust. Slowly close the gate and wait about 10 minutes to make sure everything is equalized. I have my water level in the overflow box slightly below the emergency standpipe. With the surging and changing water levels, my system is still quiet. The wave box is probably the noisiest part of the system and thats the hum of the constant on/off of the wavebox pump. Hope this helps.