Seems like a no-brainer, based on simple physics to me.
With a typical SFP optic, higher magnification results in a more precise point of aim, which by default equals a more precise "zero".
If it didn't, what would be the point of high-power optics?
At 10x, the center of the crosshairs might completely cover a target at 1000 yards. You're essentially "guessing" when you're centered. Fine for minute-of-man, not for accurate point of aim at dead center of a target.