Sorted out... The problem was actually simple in the end... Horrible horrible Australian workman ship was to blame.
Although the tyres had being balanced i took them to another place and had them put on a new machine.
They were both out by about 90 grams a wheel... I suspect their out of balance aligned occasionally as i went around corners on the freeway etc and this threw the whole axle out...
A good balance all around fixed the issue.
Thanks for the help guys.
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