It's a little difficult to tell what's going on with that sensor from the data sheet. Is it a half-bridge? Full-bridge? quarter-bridge? It LOOKS like it's a full bridge, in which case, as I said, the absolute resistance shouldn't matter. However, it looks like the SPAN variation is enormous, i.e., the first column has "2.5...5.4"-That's greater than 100% tolerance. Does that mean the value for a particular sensor is 'somewhere' in that range? If so, you'll have to calibrate each unit.
And why are you using 741 opamps? Those are about 40 years old. I think you want a more modern precision opamp.