I haven't flown the B-412EP since 2002, but I seem to recall Single-Engine Safety Speed (SESS) - indeed governed by AUW, DA, USL(?) (probably not as you can pickle that off).
I have dug out my Griffin notes (I don't seem to have an ODM to hand in the archives!) and they say:
Circuits:
Climb - 70 kts
Level - 1000' 90 kts
Finals - 20-25 % power
Roll out - 50 kts + wind
Autorotations:
HASEL cx
Datum - 70 kts
Range - 90 kts / 91% NR
Low speed - 40 kts (70 kts by 1000')
Now without crunching the AUW/DA figures, would a SESS be in the region of 40 kts, as you would want to be at that speed if you lost your single engine and started autorotation...?