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Pickguardian is the way to go. Put a black marble on my candy green so-cal and really dressed it up. Perfect fit. Much better than stock.
Had this happen on a couple guitars. Solved the problem by leveling the FR posts - if one is higher than the other, it can cause uneven tension and result in tension related tuning problems. Also, I understand that there are some quality control issues on some units. I've never seen that...
I have D-Tuna's on 4 guitars and they work perfectly. I did recently buy an EVH Wolfgang new that was in need of a setup. The trem had the same problem that you described. I resolved it by making the trem sit flat/parallel to the body of the guitar. The problem was that the trem was higher...