Today, the 13.01.2016, Sniq, Tewtal and me broke the 14% item-limit for TAS, for NTSC inbounds without major glitches.
The following two maneuvers make 13%Speedbooster a reality, which obsoletes both 14% (low%) branches, low%Speed and low%Ice, that are published at TASVideos (as soon as a proper 13% TAS exists):
Suitless Slopespark (using BlueSuit from the only known source available, Varia, to cancel invulnerability frames, in order to get a second set of invulnerability frames to have enough time to start the spark in the same frame as when the knockback frames run out):
http://puu.sh/mtmVI/014ba0fbca.mp4
Corresponding Snes9x rerecording 1.51 v.7 movie:
http://dehacked.2y.net/microstorage.php/info/1980525759/Super%20Metroid%2013%25%20speedbooster.smv
Colosseum shinespark charge (for a FlashSuit via spike-spark) in 13%Speedbooster conditions (using temporary BlueSuit movement to keep the Boost Counter, a reserve-bombjump, a bounce-ball to continue running upon the first spike-contact, knockback-frames provided by the spikes to unmorph and increase the Boost Counter, Moonwalk, and the spike-spark method):
http://puu.sh/mu5GH/b01646d59f.mp4
Corresponding bk2 file:
https://cdn.discordapp.com/attachments/98929157894836224/136810285657751552/13_spikespark.bk2