You are saying the flash meter is set for a flash sync shutter speed of 1/250 and you are worried that the 67 at 1/30 is different?
I just took a quick look at the manual online and didn't see any reference to flash sync shutter speed. But, really, the only thing you need to worry about is if that 1/30 of the 67 is sucking in ambient light in excess of the flash (which I doubt).
That is, in a situation where the flash dominates the ambient light by a lot, it doesn't matter if the meter's flash sync is different than the camera. Flashes are in the order of 1/3000 of a shutter speed. And at 1/250 it may ensure that the unit is not taking ambient into account in its reading much which is probably a good thing. But if you want to include ambient with the flash, use the cameras meter to see how much your getting relative to flash and if that speed is too slow and will capture possible blur; otherwise, it's time for a leaf shutter lens.
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