so, here is a question ive been meaning to post for a while. Over the years i have spent a lot of time obsessing about bevel angles (and relationship to steel type / hardness). Mostly, though, that has been focused on the primary bevel (the cutting edge). With regard to the secondary bevel, how do you make your design decision? Do you decide on an angle, then do the trigonometry to decide on where the Shinogi will end up ... or do you just decide based on looks where the shinogi will be, and let the secondary bevel angle fall wherever that makes it be? Too shallow (acute) will be a problem, especially for less-hard steels - how do you avoid that?