I think I know what I was doing wrong. When I was exiting the doors after launch, I was trying to shoot it from a side angle in a way. I think if I move over more, my back facing the rocket, I will get a straight shot on the glowing spot. In all the videos I watched some did from the side (pretty close to the doors) but most are facing it with back to rocket. They also said don't hold your bow back when exiting doors. To just run up and shoot quick, some didn't even need to pull the bow back all the way either.
I'll update when I actually try. Hopefully soon.
Thanks for the tips by the way Tatoo247 and Tender_Nuggett99