Hi KinsleU and welcome to TASVideos. Congratulations on your first completed TAS!
I wanted to check in with you to make sure you had looked at the following runs first:
[3144] SNES Super Mario All-Stars: Super Mario Bros. 2 by vince1919 in 07:24.30[3456] SNES Super Mario All-Stars: The Lost Levels "warpless, Mario" by HappyLee in 34:36.61[2419] SNES Super Mario All-Stars: The Lost Levels "warpless, Luigi" by KFCMARIO in 34:52.69
It may be helpful to ensure your run at least matches one of those times, depending on the category you are working on. This will require only using frame advance and perfecting your TAS so there are no mistakes, plus likely finding some new time-saving technique not yet shown in one of the above movies. As Spikestuff hinted, make sure you end the movie on the last frame of input. If you start from scratch, please consider using a more accurate emulator other than snes9x - instead, use lsnes or BizHawk depending on which one suits your needs better. I'm obviously biased and I'd love to see you do this on lsnes so I can have TASBot console verify the run but please feel free to ignore me. :)
Finally, please note that you have an uphill battle; each of the games you are attempting to TAS have already been perfected on the NES and given those are the original platform are generally considered the more faithful versions of each game. It's not to say they will never be accepted but it's going to require a bit of convincing of the judges that what you are showing is better or different enough to warrant being accepted alongside the existing NES runs.
I look forward to see what you can make and best of luck!
Thanks for the response, I didn't think of checking the movies mentioned above, I looked at the current wr runs and tried to replicate that, currently working on an improvement give what you and others have stated.