I gave in and went to Subaru today and paid $20 for a genuine filter, fitted it up, went for a 10 min thrash and had another look= seems to be sealed now but will need more testing to know for sure.

I looked over everything again today and have no idea why the Ryco one persited to leak!???. Its so much easier and much more convenient ,plus cheaper to buy the Ryco filters yet I seemed to have bother with the one I bought?..