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As other guys have said, you might want to stop the lens down a little - I've never used my 24-70 @ f2.8 for AP but I know I have to stop the 14-24 down to about f4 to get pinpoint stars at 14mm.
Have you used the lens on a DSLR at that aperture? That way you'd know whether it was lens or something else like spacing.
I'll put mine on the d800 and the Polarie and see how tight it is wide open - if it ever bloody clears up over here....
Cheers,
Andrew.
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