Hm
comparison between 206 and 369. 369 has a greater mauw at 3550 lbs ( 3000lbs if internal) v 3200lbs with the same engine. I know the 250 works harder in the 206 then the 369, bleed valve is almost fully open in 369 in cruise, not so in 206 according to the engineers.
Mind you you can only make a blade so long before it loses structual integrity or is so heavy that it is difficult to turn it !