Thanks Jim,
Your explanation confirms my understanding.
As I understand, PC1 offshore, with ltd winds and high temps, average drop down from low floaters to 90-100 ft, the RTOW/RLW limiting factor is likely to be single eng capability. Tgt Tq, again linked to single engine capability. So both are directly/indirectly linked.
The increased tgt tq with same AUW, if nothing else, provides us with additional safety (albeit carrying load less than max perhaps possible PC1)
HB