Hey mashman,
What weight oil do you have in it now?
I've had this problem for a while (even with a reco'd head) but after going back to an OEM oil filter (Mann, Hengst, Mahle ect) it seems to have died down.
Next step for me is to take the sump off an check the oil strainer for debris.
EDIT: Does your car have an aggressive cam?
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