Being only eligible for Vault does not mean you can leave unused time savers while they are not hard to use. Vault is for movies that were not liked by
enough people, but that tier exists for people whole still like such movies! So there are always people who would like a Vault movie, in this case it's me.
And I advise you to revisit your last level and just check which moves can be done sooner. For example, there is a spinning platform that starts moving as soon as you jump on it. Then do a jump earlier on the ground to get onto that platform sooner, it must start moving sooner. Another tip is that jumps usually increase vertical speed, so if you need to get to a lower platform sooner, you can not just walk off the upper one, but jump from it. It is a common TAS trick that works in a huge majority of games.
Other tricks can be read about here:
http://tasvideos.org/GameResources/CommonTricks.html
And here is the overall guide:
http://tasvideos.org/TasingGuide.html
Also, I meant not the externall application called TAS Movie Editor (that allows copypaste), but the internal FCEUX tool that allows heavy editing and watching in real time.