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You say your stars are nice and round? Your guiding graph is fine then.
I think we all get too wrapped up in trying to get a perfect guiding graph.......think about it, if it was perfect without any errors then why would you need guiding in the first place???
You also need to think about scale. Different guide/imaging scope with different guide/imaging camera pixel scale often means a gig error on a guide graph is actually minimal on the final image.
......edit - and just saw your exposure time...0.5 seconds. Go to the 2-4 second mark and I think you'll see the guiding flatten out. At 0.5 sec you are probably correcting seeing issues, not tracking issues
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