When I started CA-1 almost 3 years ago over 50% of programs used AKT, now it is less than 25% and most are in the process of dropping it. Was extremely unpopular and mostly viewed as unnecessary (since the "Anesthesia Knowledge Test" was given at 0 months, 1 month, 3 month, 6 month, 12 month, etc... it simply got excessive). My program dropped it as soon as it was able (it agreed to a 2-3 year trial run as part of the initial study). We haven't had it here in over 2 years. I'm sorry you've been subjected to it!
That being said, it is so easy to overcome one poor score with an otherwise excellent application with research, good LORs (which play a much larger role than residency since the fields are smaller).