>So, for now....I'm leaving in the Allegro hall sensor and
>op-amp and just see if I can function with that or just....
>leave that piece out.  Its not the most critical part of the design.

Another option would be to use a second stage of gain purely for detecting 
very small currents, and when that stage saturates (or the output is larger 
than some value below saturation) then look at the output of the earlier 
stage (I assume this is some form of metering application).

As you are using Allegro devices, how sensitive are they to nearby magnetic 
fields? I haven't gone digging in the datasheets and app notes for detailed 
info as yet, as this project is still in the incubation stage. 

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