BDL, in your opinion what is the optimum RV for 52100. I would think with cryo it should not be to difficult to achive 60RC and still have a non chippy edge. Sharpening on the other hand my be a bit tougher, but no more of a challange than some of the Japanese blades.
The Rockwell C hardness testing methodology is screwed-up and inherently inaccurate; on top of that, hardness varies a great deal from steel maker's batch to batch, and same hardness alloys might get different numbers from different makers. Optimum is more a range than a number; there's more involved to "strength" than a particular, hardness sweet spot; and what you're really looking for is an ideal strength/toughness balance than just "very strong."
Compared to Hitachi White #2, well hardened 52100 tends to be less strong but tougher.
While I know enough to sound confident and knowledgeable I'm not a materials guy and not even really a knife "expert," so much as someone who nags you about sharpening, helps you find your own priorities, assists with unraveling some of the other mysteries of pro equipment and techniques for the home cook, and encourages you to have a good time. Despite the "Equipment Expert" title CT gave me, I'm more about cooking than equipment.
If you really want to talk about the ins and outs of hardness you're best bet is to find someone else. Normally I'd refer you to Mark Richmond (as a maker) and Jon Broida (who's incredibly knowledgeable about nearly every knife thing and how it relates to sharpening), but since you're considering becoming a dealer yourself you'll have to get over the AWKWARD! on your own.
With that out of the way, I'd say 60 - 62 RCH is the right range. If I were looking at manufacturer claims, I'd say 60 was on the low side, and would keep it to 61-62. Kramer and Richmond both claim 61. I think Mark Richmond sources his alloy from Crucible and has the knives made by Lamson -- but I'm not sure. Kramer -- quien sabe? Shoot him an e-mail and a credit card number and you may get an answer in three years (joke).
Worth noting that even at 61 RCH, 52100 sharpens pretty well on oil stones. Not so Shirogami 2 at 62 - 63.
BDL