Levo,
If you are interested in particular speeds for data recording, fair play to you, record away. (Gazelle 95kias, EC135 90KIAS).
If however it is to help achieve decent PFLs in any aircraft, my advice is to not complicate matters too much.
Most turbine helis will be decent for range at about 90 KIAS. The difference in range speed between those you have listed is negligible and indeed clearly limited by pilot accuracy whilst trying to select a field, shut down engs, etc etc.
Remember too that there is a big difference in an Autorotation and a PFL.
An auto is an academic exercise,it is about hitting numbers and noting glides, nr etc. Autos at different speeds and NRs give you a tool box of skills to pull out whenever you need them........that would be during a PFL; Or a real one I suppose
A PFL is all about making a field suitable, if that entails flying at 60 kts for a bit, then 72, then 96, all that is fine. If you are into the first third of a field, with sufficient energy to land safely with either a flare and cushion or just a constant attitude cushion it was a good PFL.
If you manage to shut down engs, get a call out, warn crew/pax etc etc.................a very nice bonus.
Happy Flying mate.