Well, looks like I may have been wrong. I have painted the inside of the flattener with no success. I have also tried turning the filters around with no result. The only thing that works is to remove the flattener from the imaging train so I'm going on a long shot here but it must be a reflection issue between the flattener and the filters.
The flattener is really good at resolving guide stars for the OAG, as for the star field, I could nearly get away with it.
At the moment, it is no flattener until I can be bothered to get adapters made for the 2.5" TS full frame unit I purchased here.
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