We originally thought the opamp slew rate was too low, but the ones we have now are for over 200+volts, so we know that's not it. And the original design did have the four opamps in the same housing, which we now have as seperate packages.
Although with both of these we still don't have it behaving as it does in the designs. We also thought interference from maybe the leads, or capacitance in the circuit, but we've all but eliminated those with it now.
One idea was that the circuit was feeding too much on it's own gain, so we decreased the circuit from unity gain, down to .5 gain. However, now we're not getting any discernible output.