After hating the starting strat for so long I decided enough was enough. So I came up with a strat that doesn't use Multi-bind Jump! Now I still use Multi-bind on Slide and Forward key, this is so I can more easily start using Manual LRF. And now the start is actually super consistent, making this level not as bad to grind anymore.

An issue with this strat (or maybe I'm just not doing it right) is that it's very hard to get a jump at the end of the tunnel and make it to the Wall Boost. Because of this I don't use LRF in the tunnel so I don't have too much speed. Now luckily I got insane amounts of speed anyway and then into a godlike Wall Boost.

All in all this run is amazing and won't be easy to beat and I'm super happy to finally reclaim the world record!