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Ive used Glens video for my 2 Tosukes and Iwasaki with exceptional results.:)

I think you was right to go with the blue #2
Found some more info:
Yasuki steel
A Japanese steel derived from iron sand which is known to be traditionally used in the making of the nihonto....

Found some good info at these sites

http://www.mehr-als-werkzeug.de/medias/sys_master/124_01_M_WE_D_en.pdf

Tamahagane Steel

I can only say what I've read about two carbon steel types “White-2” and “Blue-2”, these give a HRC hardness of between 58-60 for “White-2” and 60+ HRC for “Blue-2”.

This hardness in practice...