Flutter below 2k rpm

I don't pay a whole lot of attention to my AFR gauge at idle and low-RPM cruise; I tried tuning those with the gauge and it ended up being too lean. Didn't have "flutter" but wasn't responsive and would stumble when opening the throttle slightly. With a carburetor and a cam with any kind of overlap the low-speed AFR readings aren't accurate. I have a 360 with a 222/226 @.050" hyd roller cam and only 9:1 static comp with aluminum heads running at 5000' above sea level. I don't notice any "fluttering" below 2000 RPM but because of the cheap loose 2600-stall torque converter it doesn't spend much time at those speeds unless I'm basically coasting down a flat road barely touching the gas pedal. However I'm running a 750 cfm Street Demon which is a bit different than an AVS.

At this point I would ignore the AFR gauge and just tune the carb so it runs the best. Mine now says I'm running 12:1 AFR at low-speed light-throttle cruise but my spark plugs say otherwise, I just ignore the gauge now unless I'm getting on it hard. That gauge will drive you nuts if you try to get it to read perfectly at all loads and speeds; it's just not possible with a carburetor. EFI, yes.