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OPA170: Increasing opamp gain

Part Number: OPA170
Other Parts Discussed in Thread: TLV9101, OPA990, TL081H

Hi,  this is my new thread in relation of my other thread (OPA170 Abnormal Behaviour).

My setup (use as current sensor : V2 connecting V3 with ~0.1 ohm;150C test)

V1 = 12V, V3=13.5V and if there is a short circuit, V2 will reduce until the different ~120mV. this voltage will feed into my  next comparator set at 0.5V to trigger next circuit.

based on differential calculation, Vout should be ~0.6V however this is not the case, based on previous thread.

Since Vin for OPA170 unable to extend from (V+)-2V and V+, the new Rf will be drop to 80k with gain ~2 @ Vout=0.24V. 

so the question are :

1. Is there any recommendation to increase the gain further back to > 5 ? need simple solution as i have comparator at next stage.

2. OPA990 or TLV9101 will be good for rail-to-rail Vin but it did not fit temperature requirement,150C. Any other 150C rail-to-rail Vin suggestion?