After a seminar by ST, I will be reworking the opamp to be a TSZ124. Also, Plessey recommends the low pass roll off be around 200Hz and that I use the 10x gain not the 50x gain sensors. So not the PS25251, but the PS25253 nor the PS25451, but the PS25454. The advanced Notch filter design works great, so I'll be releasing an updated version of it and this board (which is good for differential ADC) with a new low pass filter. I'll be working on a 2 channel design that utilizes the TSZ124 in both a filter and gain configuration soon.