Regarding the jittery top and bottom of the video, AM doesn't include any security measures with the Make Daily tool which would mean that the jittery video is possibly coming from somewhere else. Have you tried opening the playblasts outside of Premiere to see if the problem still happens? If it does the I would guess the issue is with Maya, however if the issue only happens when opening the files in Premiere, then it could be a codec issue of some kind.
The Make Daily tool is basically an advanced playblasting tool which will create a playblast then encode it to the h.264 format to be uploaded to the AM site. This format is one of the most popular video formats for low size and good quality, which is why AM uses it, and should also work with almost all programs and websites, such as Youtube, without any issues.
If the jittery problem is happening in any program, then I would recommend double checking your playblast settings to make sure they are set correctly. Here is an article which shows the recommend settings for AM https://support.animationmentor.com/hc/en-us/articles/201927207-Setting-up-playblasts-for-upload-to-AM
If you are playblasting files to use in a compositing program such as Premiere, I would recommend not using the Make Daily tool as you should be able to get better quality files from regular playblasting as they aren't compressed. You could also increase the playblast size from 720x405 to something like 1280x720 which would give you a better quality playblast. Then in Premiere you can scale the file back down to 720x405 which should still keep more details than before.
I hope this helps. If you have any more questions or issues on this, just let me know.