I didn't think it was really possible to adjust a herbie so it didn't drift one way or another very slowly at best. Plus the flow rate can shift as the pump gets dirty etc. I figured everyone had a trickle down the emergency or had a tiny bit of air going down the siphon. So the emergency with trickle is quietest and the emergency still can handle more flow than your primary siphon since its unvalved. The bean has the extra emergency which is nice but I doubt it's needed.
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