I am able to get through every other part of the game fine enough, but the X-Wing level is just so hard and fast paced, how do you keep a good streak through this part?

I assume you're talking about the 2nd part of the shooter section of the game, last before the death star trench auto-scroller. While the 1st part is arguably much harder to do optimally for the speedrun, the 2nd part gave me a lot of trouble at first just to even survive it without dying. One problem that I was doing was trying to follow the TIE fighters with my cursor and they seem to always get out of reach. A trick you can do is keep your cursor towards the center briefly which can bait the TIE fighters towards the center then do quick jerks towards them to pick them off. There are 2 phases with the horizontal 1st phase somewhat easy. The 2nd phase where they come from all directions will take some more practice.