1.17 seems to be tracking the IDAS system very well. I will have to wait until there is more traffic on the system to be sure but it definitely is following conversations with way more accuracy.
An update from my side. I had a chance to monitor the Phoenix-Mesa Gateway airport system today. With firmware 1.19.00, my BCD436HP is tracking the system well during the few minutes that I had to monitor. The ID Alias feature is very nice. Thanks for all the support Paul and Uniden!