I initially had problems with Classics 10 because I didn't quite understand the level or how best to proceed after the wall boost, and I didn't have perma-sliding active the last time I did it two years ago, I think, because I do didn't know yet. Sub 7 has already been done but I think I'll try again soon. If you hit the bottom left corner and wall with speed you get a big boost, which is essential for no multi bind runs. You can also see that six seconds is possible with legacy.