It hasn't been noted here yet, but there's an alternate set up to get past Kraid's door that should be an improvement in the any% tas
https://www.twitch.tv/chx42/clip/SpotlessHandsomeNeanderthalCmonBruh
basically, you can abuse the way the game is loading the rooms. get stuck in the blue door offscreen above the camera. shoot door, morph and roll left (frame perfect left press) the game will load kraid's entryway during the fall and you can slide past without the bug boost. Hacker/randomizer maker MetalMachine put out a lua script that helps visualize offscreen rooms in NEStroid, and that's pretty much how this skip was discovered.
There's more info in the NEStroid speedrun discord, and the link to that should be on speedrun dot com's nes metroid page.
ps: i didn't work on 100% after all :D
--retrogaming2084/Josh