Clearly something very very wrong with your 206 if you're power limited & watching RPM and torque on a conversion, and how does "throttle" come into flying it? It has an FCU for that...watching RPM though, regardless of torque? Why? Dud FCU?
I'd change aircraft and perhaps instructor too.
Bertie, I went from Bell 47 to Chinook! That was a blast!
But Enstrom A model to Hughes 500 some time later was the best.