I have encountered a similar problem, although it seems to be that the video out of the Kona SDI output feeding my baseband monitor lags the video and audio in the sequence. The audio out of the Kona AES output feeding my speakers seems in sync with FCP, but appears out of sync with the program monitor, i.e. it is slightly ahead of the monitors video. Is this the same as what you experienced? I have not tried the slug workaround yet but will.