A little more info about the movements of the destroyer here:
http://www.combinedfleet.com/kamika_t.htm
Note that in the middle of July it was on a run up to Ha Tien (Indochina) and back.
Also note the incident on 12 June involving the Toho Maru and a "B-24" (or VPB) attack. This happened also in a run up to Indochina.
It seems if we can't narrow this "incident" down to an actual date or exact place, it might be hard to find a plane loss to match up. There were some VPB planes lost off Indochina in this time frame also.