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I don't own a v4 so I couldn't see the issue but after your video its now clear to me what is the problem.Good question. I'm not really sure. As far as the chassis, I hammered it flat and I'll continue to use it.
When you land, the heavy battery/motor flexes the center of the chassis down, which tilts the front/rear gearboxes towards each other, the center brace forces them to stay straight as the chassis flexes down, and so the front/rear braces are being pulled, now, the front/rear braces are not designed to be pulled and so instead of bent braces (which is the usual damage before the center brace), now we see the opposite - the braces being torn apart - like happened to you both for the front and back.
So as the chassis flexes down and the brace forces the gearboxes to stay straight, when the front/rear braces give and break, the chassis bent in that position.
As I see it, the solution would be to have some give on the center brace, just like they did on the 4s line.
I've attached a professional illustration
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