Fly to survive!
Engine parameters and rotor speed limitations are there, in the main, to ensure that everything reaches TBO at the right time.
Even Frank R will tell you at the school " the engine (in an R22) is rated to 160hp - dont crash just because you didn't want to exceed the MAP limit for the day!"
Rotor overspeed, vne exceed - who cares? when it comes the time to put all your training to good effect - LIVE!