My Focus Backdash + Super strat on Trial 4 is ~0.6 seconds faster than what was normally used. Other than that, I basically stole every idea from Jingojungle (previous WR holder) and grinded at these trials for 2 days straight until I could do all the hard FADC strats consistently.

Embarrassingly I whiffed Air Tatsu twice on Trial 11, which cost about 2.5 seconds. I thought that would make it impossible to get WR since the previous run was so optimized, but it turns out Jingo wasn't mashing Start+LK quickly to advance between trials, so I saved about 10 seconds just on that (our runs would basically be tied without that)