All the Zoom boxes I'm familiar with (H2,H4,H4N) don't like a really hot signal from the soundboard. They need something like 50db attenuation. Experience has shown if you turn the gain way down on the Zoom, looking at the meters will think you are getting a nice feed which isn't clipping, but when you listen to it, it's terribly distorted. It's called "brickwalling" internally.
The other thing is that most SBD feeds from small clubs are terrible to listen to alone. It's mostly just vocals and kick drum mixed up the middle. The days of the fantastic board feeds from GD and The Radiators, mixed just for the purpose of taping, those are a thing of the past. If I have a choice of AUD or SBD, I'll take AUD. if I can get both, I'll take both into a 4 track recorder and use some of the SBD to make the vocals sound crispy, and that's what I do at 90% of the shows I go to. But it's pretty rare that any of my tapes have more than 50% SBD. That only happens if the place is so chatty the AUD really sucks.