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I spent many hours trying to sort this out with the FSQ and 16803. The tilt tolerance is pretty tight on this damn thing. End result was 0.2mm in one corner and 0.1mm in the adjacent corner. The best way I found to dial in the error was to use a bahtinov mask as it clearly shows the inside focus and outside focus error and the degree to which it is out. I then shimmed it out with square bits of coke can (0.1mm thick I think). Very fast way to shim out the error with very little guesswork involved.
To determine axis of error, rotate the mask 90degrees ;-)
Shim it out and confirm each axis again by a final 90degree rotation.
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