Want to change my overflow (Herbie Question)

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Talking about this with a guy in Edm with Herbies (removing overflow boxes and just relying on standpipes.)

Seems in principle would work if the water lvl was rocky steady. Concern would be tuning the primary Herbie drain if the water level varied from a wavebox, OM-4way or even powerheads with varying flow or on/off cycles with a wave maker. This was all discussed based on the experiences of tuning with a ball valve, not sure if a gate valve would give a wider sweet spot.