Austin,
From the information on this site below, you can see there were no Luftwaffe Claims on 29th January 1944...so we can "assume" the Typhoons losses on this day were due mainly to FLAK ( had to check all files yet however...)
http://aces.safarikovi.org/victories...on-tempest.pdf
Hope to have helped to have a full picture of the activities that day...I am still sure someone who has access to the ORBs will help you to identify the letter that is missing JX-????.
All the best for you on your search
Yours
Adriano