Determining IGE hover at altitude  

Thats exactly what I said. Being close to the limit is entirely different in an R22 vs 206 vs 407

R22 the engine is going to be your limit, if you pull too much pitch RPM droops and she quits flying sooner then you might want to.

206 with older TR blades you will most likely be running out of pedal, no big deal if you planned it right shoot your approach gently and park it just before she starts to rotate on you. Gets a little tricky in confined areas with shifty winds.

407 just pull pitch until some warning light blinks at you and lower the coll a little.........kidding, probably be monitoring the MGT closely and since it's a higher disc loaded rotor design small changes require more HP.(read some Ray Prouty articles on Aerodynamics}

205++ just enjoy the ride and don't worry about a thing. If you're heavy wait a little and she'll "hop" herself out of the dip/confined area. Just a lovely ol gal!