Did you look at the load cell datasheet and notice that these load cells have a nominal 20 mV/V sensitivity (and the 0200 version has a nominal 36 mV/V sensitivity)? Since the HX711 excitation is about 4.3 volts, that means the load cells will output a differential voltage of 86 mV (or 155 mV) at full scale.
If you look at the HX711 datasheet, you will notice that the maximum permissible input differential voltage is approximately 20 mV (at the default 128 gain), 40 mV (at 64 gain), or 80 mV (at 32 gain).
You should be able to get near full scale with the 0100 version at 32 gain, but no where near full scale for the 0200.
Incorrect calibration may also contribute to your problem for both load cells.