I wasn't being that specific

, I was assumimg that thinning the blade out behind the edge was due to earlier customer feedback similar to my own (later) realisations?
I did the same test with my fixed blade L.T. Wright Patriot and it also sliced far easier due to being thinner behind the edge despite being thicker than the roundhead at the top. I don't cut cardboard all that often but it's a good measure of slicing ability which of course translates to all kinds of cutting tasks. Trying to cut cardboard with a hollow grind vs a FFG really explains why hollow grind is so much less 'apple' friendly for example.

I actually do think 0.02" thinner behind the edge would make a difference but I don't have calipers to test my current knives to see the difference. Would be interesting!
Going to make the Roundhead work though, heck but it's a great knife. Many have commented on the steel, the ti bolsters or the scales. One thing I've found which is mentioned less is just how incredibly user friendly this knife is. First of all it's hugely comfortable in hand. More than any folder I've ever held. It fits in the hand and stays there without any hot points, any uncomfortable bits or strain. The handle feels like a far more palm filling tool than it actually is. Then there is the super friendly opening, springing into the half stop is perfect for my disabled fingers, helped by the genius of dual nail nicks (why doesn't everyone do this!

).