Thanks for replies, but perhaps I did not explain the situation correctly.
If you have full fine pitch set on prop levers and you are not getting max rpm on a prop, is it correct to say that we are not getting max thrust from that prop?
The reduced rpm is not by choice, but a problem somewhere...so when the good side fails and you are left with an engine which is delivering max torque to the prop, but is not getting max rpm, is performance degraded?