I've changed my mind about C1 - it needs to be removed entirely, and the inputs from your foil strips need to be buffered.I tried connecting it in series, but i saw that the output was pretty noisy... so, i got confused, if i should connect in series or in shunt it to ground.
That was not an application schematic - that was a parameter measurement information schematic; the test circuit to show how they came up with the specifications.About R2-- I saw it in the datasheet... there was this application. on pg.8
You do not need or want that kind of loading on your opamps; it will just cause excess heating and power usage.