I agree with Pap, those files are a ballpark indicator only, I too use them and as noted they aren't accurate enough to give a proper rating, plus the results are very subjective. We all know just 1 or 2 points of HRC can make a huge difference and as an example, M390 at 58 HRC is usually underperforming in almost all cut tests (edge retention) and yet 60 HRC it starts to perform very well (within manufacturer expectations and end-user expectations) and 61-62 HRC it usually performs exceptionally well.
The only real way of getting a definitive HRC results is to get a proper HRC testing machine, which unfortunately is very expensive.