Hi Kari,
I think you did pretty well - I have done a lot of research on 6 Squadron and their Hurricanes, the postwar stuff went into a book but have a lot on the wartime era as well. Had a quick scan of my notes and the Tito visit to the airfield was on September 2, 1944 so I would suggest that the August 31 sorties would be the most likely - I have a photo of the airfield that shows the proximity of the hills to the single runway.
during this time 6 Squadron was still based in Italy with Vis as a detachment so the ORB only records operational details of what was happening the