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Strange ADC behavior at lower voltages using an MSP430

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smoothVTer:
So it all turns out the NFET was turning on fully, but the PFET was not due to the lowered source-to-drain voltage when VBATT was low.  The PFET in the DMC3400 device had a max Vth of -2.6V !   So, my bad on that miss. 
 
Luckily, I found another pin-for-pin compatible NMOS/PMOS pair in the same SOT-363 package:  the DMG1016UDW  which has a max Vth of 1.0V nmos / -1.0V pmos.     So don't have to do another board rev, only a BOM revision. 

Thanks for chiming in everybody!  When I have time I will look into doing this a bit simpler using one of the suggestions above.

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