I'm trying to submit a run for Von and just wanted to know what is the best strat (i.e. what is the best/fastest strat for I.L.)?

Just do your best and cheese the heck outta the game.

If you watch the current strat used in Single Segment runs, you can get a 0:35.97... There is a faster strat though, if you use this strategy which is very close to the TAS strategy (they can still get the same time) you can get the time down to 0:35.61. This strategy is harder and is more random.

There are some cases in which people can beat TAS... But very hard to pull off...