Hey @Plumbs cant believe i only just found this thread, ive been following all the BTR hints you have give out in other threads.
are you sure the BTR commands the TRC tq reduction on shifts? the zf uses the Trans Shift Modulation TQ reduction. Are you just triggering TRC as you have to much power?
can you clear up the btr shift map names and what they actually do, i believe you said somewhere else that towing map is actually performance mode?