Ok, there are two separate situations here. The premise was to make the core as stiff as possible, which was achieved. The other situation was to see the influence of said core on the speed and feeling of the blade. It's not that it failed, it is what it is, it's just that my expectation was that the influence would be greater. The core is indeed much stiffer than a regular Kiri core, and I was able to prove it before I glued the plies, as the resistance to bending was far higher with this core. However, that didn't necessarily translate to a much faster blade, which makes total sense. Stiffness is generated by having material far from the neutral axis, and in this case the core wasn't thick enough to create that stiffness. If the core had been 4mm like I originally intended, the influence would have been much greater. I want to try that, but I'm so traumatized from building this one, that I don't think I will do it anytime soon 😂.
I did try that, mostly because customers asked me to do it, but that's a really ineffective way of using a composite layers. As I explained earlier, in that situation the composite layer is right in the neutral axis, so the influence on stiffness is almost negligible. It still impacts vibration, hardness and feeling, so it does affect performance, just not stiffness.
Truly a wacky idea, I have no idea how to accomplish that 😅.