Two problems:
First, the input impedance of this circuit is far too low, which is what is dragging the sensor output down. Increase the values of the 1k and 10k/15k resistors by a factor of 10 or even better 100.
Second, this circuit
appears to have a gain of -10, while you seem to want a gain of something like -(3.6/5=0.72), so the 1k and 10k resistors need a different ratio. (I could be wrong here - it's been a long time since I did this, but check into it please)
Here is a spec sheet for the LM358, study it (especially the examples at the end) and use Google to look up op-amp circuits (you want an inverting gain amplifier, even if the gain is -0.72).
Good luck!