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If you turn the screws and your printer starts to wobble on it's Y axis then in my opinion you are over tightening the braces.

The higher you print the more the motion effect comes into play.
That is why the braces are needed to eliminate the upper motion of the printer in x-axis (left to right and vise versa).
This is one of the drawbacks of the A8. The A6 doesn't have the problem due to a different frame design.