Thanks for the precision, at operating speed torque is the same. it is as you mentioned the combustion stability that prevents turbines to provide has much punch as the turbo diesel.
if I am not mistaking former design turbine (like the Turbomeca Artouste) used to be quite stable due to a generous dispensing of fuel,
the new generation(like the Arrius 2F) have been starved in the name of fuel economy thus making their operating position/region very small.
those of you who have flown the 300 (not equipped with governor) might know how responsive the engine is on the up side to recover that RPM, (that is, if not over-pitched yet).
I have heard an Arrius 2F cost $475K to overhaul, that tell me engine cost must be a bit above that number, that leaves a lot of money on the table for that turbo diesel engine.