Hrm where was the score from and how many tradelines (revolvers specifically) do you have outside of the AU?
myfico 3b monitoring. i have 19 revolving accounts of my own
Transunion score was 620. Up to 633 when AU reported, fell back to 620 when it disputed off.
Hrm, only thing I can think of is it made a material difference to your revolving utilization.
I'd test it next month by reporting like 1% and seeing if it made a difference. Otherwise, limits historically have been irrelevant to FICO scoring.