To understand the Tatara (to the extent that any of us are razor designers ), I downloaded their chart and compared the four permutations against a razor I know and am familiar with. For me, I referenced my trusty Overlander.The Tatara razors have always confused me. I'm sure if I took some time and really concentrated, I'd get it... This cap with this base plate=this efficiency... And then they offer the adjustable. The names for the caps and base plates instead of numbers... too much for this old mind of mine. <eg> ...
Best I can tell, the Overlander falls between the "full" Masamune and the Nodachi cap / Masamune base plate (I refuse to conjugate the latter into unintelligible terms). Perhaps it leans a bit toward the latter in both feel and efficiency.
I suspect you knew that ;-) Trust but verify ... of course
Therein lies the challenge (the verify part). It's not quite like budgeting for the next particle collider, but experimentation certainly does co$t.
... Thom