I think the Dual Layer breaking issue, as Brad calls "Screw Syndrome", is not so much an issue with the design of the layers themselves, but rather the screws themselves. Looking at the screws on Wyvern and comparing them to Victory Valkyrie, they are slightly different. Most notably, the V2 ones are larger. This could mean that they're just slightly too big for the holes they're in (By a microscopic amount), and is compromising the structural integrity of the points where they're inserted by expanding the plastic in ways not intended by design, stressing the points of insertion.
The incident that lead me to this idea is the Random Layer Vol. 4 Xcalibur having breaking issues when all other releases of Xcalibur not having that issue. The only differences between the two are the plastic color and the screws, and with both plastics being of the pearly metallic type, I doubt that's the issue.
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