found some info on the "third" site, it is the Avochie Stone - I've added a site and pics, fieldnotes to follow. It doesn't feature in TMA and only gets a short paragraph it the Rothiemay circle section of Aubrey Burl's SS of Britain... book. He seems to think that it's a ruined circle - if the scattered stones in the field are anything to go by, it would be HUGE, dwarfing anything else in NE Scotland. There is certainly a vague circle of stones that seem placed and fallen.
If anyone has any more info on this site, please let me know!