I, for one, welcome our new self-improving TASers. The fact that this is an improvement to a run he's already submitted is enough for me to show optimism on the matter (more than most newcomers who submit here...) rather than negativity and hostility towards him. Perhaps you guys should be more welcoming and supportive of such people.
Zowayix: If you intend on optimizing further, I highly recommend reading the
Super Mario Bros Tricks page. If you're aiming for speed (the only thing that'll likely have a hope in hell of getting published... *sigh*) then the tricks there will be invaluble. On the other hand, if you go for an Air-like demonstration, then only optimize those bits that
should be fast (like overworld and getting to interesting places), and be sure to demonstrate as much as possible of different levels / previously unused enemies.
While I somehow doubt the run would be published either way (judging rules sure are strict these days), I'm sure it will entertain a fair few people on the "lets see you play something" thread, so be sure to post there at least if you haven't done already.