The issue with the grain, is that the timber can have different density and strength at the center compared to the outer rings. When load is applied, one will deform more than the other, causing neck twist. When the neck expands or shrinks with temperature, it will twist. On this neck, the center of the grain is way off to the side, all the way to the headstock.
Combined with your comments on neck angle, I fear I've bought something of very poor quality. If this is an ongoing issue with this model, why haven't they adjusted their jig and fixed the problem?
You're right; the action is some 3mm too high. I did a test fit-together before gluing and failed to notice the issue.
It seems the bridge has to sit all the way down on the deck, or possibly 0.5mm lower, to achieve an acceptable action. Taking some metal off the bridge looks like a quick-fix, especially as this is an easily removed piece. Filing down the saddles also looks like a way to gain a couple of mm.
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