Thank you for the feedback. I'm still quite new to the Emulation Scene so I thought asking about the TAS Forums would be a sensible way. I did try to use both nullDC and Reicast however both are no longer maintained as found on https://emulation.gametechwiki.com/index.php/Sega_Dreamcast_emulators.

My apologies if I implied that FlyCast has been used to create a completed TAS. I saw that you were using FlyCast here https://tasvideos.org/Forum/Topics/24815?CurrentPage=1&Highlight=525504#525504 and thought that this was a completed run.

If you have any suggestions regarding better Emulators to use, I'll be more than happy to try again, there is a lot of room for Improvement and so hope to submit a new one soon.