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Four Half Bridge Load Sensors outputs highly fluctuating values

I have four half bridge strain gauge load sensors connected in a wheat-stone bridge configuration. I have fed the output of the sensors to the ADC (ADS1230) which is a 20 bit analog to digital converter.I have used ATMEGA16 microcontroller that takes the input from the ADC and displays to the LCD. But I am not getting constant reading .i.e ADC value is highly fluctuating and there is no way i can measure the weight accurately. I had also twisted the wires coming out from the loadcell. Here is the link to the load cells that I have used.

And the schematics as follows:

schematic

simulate this circuit – Schematic created using CircuitLab