Not necessarily; 1 Mohm resistors inject 13 dB more noise current than 20 Mohm resistors.
EDIT: Sorry, that's a silly remark. It's true, but the noise from the resistors is negligible compared to the 0.4 pA/sqrt(Hz) from the instrumentation amplifier anyway.
It's not clear to me what the input capacitors are for anyway, as a piezoelectric sensor is capacitive by itself.
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Makes sense; the INA111 has a much lower input current noise than what you use now, and only a little more voltage noise.