I have a sunset trajectory and I used to have the same problem. I have practiced a lot and it went away. What I do is when the yoyo is almost back I curl my hand in slightly and flick it back out. It doesn’t move into the string or change it at all. It is more stable the harder you flick but can spin out if flicked to hard without much experience. I also try to flick it a little higher that straight out so that it stays horizontal. I hope that I helped! 