Personally, I think it is not particularly helpful putting the H/V curve in the RFM section 1: Limitations! It is further complicated by the fact that most manufacturers pay lip service the issue and simply publish a single graph for a 'worst case' situation of a high DA and mass. I say 'most' because (as Geoffers will know) some manufacturers - such as AW - publish very detailed information.
The fundamental point is the curve is not fixed - it is completely amorphous depending on a number of variables, and in some situations if may completely vanish (clearly when talking about ME aircraft!)