I'm estimating the Avo gain I need from the ADA4530, looking at the large signal gains in the spec sheet – we’re operating at DC, no frequency falloff to consider. The gains are:
5V test… 120 dB MIN 143 dB TYP
10V test… 125 dB MIN 150 dB TYP
15V test… 130 dB MIN 155 dB TYP
…and extrapolating to the 17V maximum supply,
17V estimated… ~132dB MIN ~157 dB TYP
The feedback resistor on the Evaluation Board is 10G ohm, which I calculate as 200 dB gain. Unless there is a MAX gain that is cherry picked for the Evaluation Boards, I may be determining gain from the wrong parameter or test.