Checking through my files, I've also got an 11-page report called "Fighting Withdrawal of 'Kampfgruppe von Sivers' as a 'Floating Bubble' in the Worskla Valley from Tomarowka via Borissowka-Graiworon-Pirasewka-Kirowka as far as Achtyrka in August, 1943". Whew, quite a title! As the title says, this report is about the unit's actions in August 1943, so it does not cover Kursk. It does, however, say this about the commanders:
"Rittmeister von Sivers, Commander of Pz.Abt. 52, who had fallen ill at Grafenwöhr [the training area where the battalions first received their vehicles - JM], did not resume his command functions until the offensive operation [meaning Kursk - JM] had been broken off, in which his detachment had sustained heavy losses. After the dissolution of Pz.Rgt. von Lauchert and after having taken over the scarce remnant of tanks from Pz.Abt. 51 ready for use, but primarily those awaiting repair, Pz.Abt. 52 was directly attached to XXXXVIII. Panzerkorps as an independent combat group."
This seems to imply that von Sivers took command of Pz.Abt. 52 very soon after the Zitadelle offensive was broken off on 13 July 1943. The report states that von Sivers was in command when the unit was pulled back to its original positions.
Unfortunately, throughout the report, there are absolutely no mention of names of company commanders. Sorry. However, the report was compiled by Walter Rahn, in August 1943 Leutnant and Ordonanzoffizier of Pz.Abt. 52, and Klaus Groeger, in August 1943 Leutnant and Adjutant of Kampfgruppe von Sivers. Apart from von Sivers', they're the only names I can find.
I was in contact with Walter Rahn in mid-2000 and he was a very helpful old chap. I believe he is still alive, so if you're interested in contacting him, send me a PM and I'll give you his details. I don't believe Groeger is still alive.
I know that a member of this forum, Didier Lodieu, has written two absolutely excellent articles about these Panzer-Abteilungen (hopefully he will read this thread). In fact, they were published in the French "Magazine 39-45". Didier was kind enough to send me copies of each magazine, but unfortunately, I've loaned them out to someone and don't have access to them at the moment. From memory, I think those two articles can answer most of your questions. I suggest you track them down.