All frames from earlier stages have been carried forward to the end. We've lined up on the 32-frame cycle after Stage 3, so sync happened without issue on Stages 6 and 2.
The basic strategy was to use the billions of frames we've saved, and incrementally lose them on the way to the end until we're left with only a few. Somehow, the stage had a lot of added lag, apparently 4 extra lag, so we'll need to reduce that. I have thrown away three frames, two of them at the end of the stage, so now might be the time to find ways of strategically delaying to get around the lag. However the delays work, as long as we don't leave our current frame rule, this will not affect sync of the remainder of the run.