Cran....what about strapping on a couple of Rockets
All Helicopters run out of puff - ALL of em; at X - AUW at some altitude & temp.
If You think the Crapinson 22 runs out of puff fast, try flying an H269 or a Franklin engined 47D
It is not about pumping in more steroids, NO
It is only about knowing thy machine & thyself & NEVER, EVER exceeding either limitations
Fly her within the RFM flight envelope & You'll be OK, it really is that simple
Happy landings