So today I got myself a yyf dv888. I’ve gotta say that this is my first unresponsive yoyo, so I’m still learning how to bind etc… I am very happy with the way it plays, except for one thing. When I throw a sleeper (even if it start out straight) the yoyo tends to tilt to the right pretty fast, which makes it even harder to bind it. The only thing I did with it was change the small bearing with the big one when it came out of the box.
Practice your throw. Try to keep it nice and straight. Try doing it slower at first and make sure that the yoyo is rolling off of your hand nicely. Also check to be sure that when you hold the yoyo in your hand, the string that feeds into the yoyo from your hand appears to be on the top of the yoyo not underneath it. Hope this helps.
It is most likely your throw because I have a dv888 too and I thought it was the yoyo but my throw was not smooth so just practice your throw then you will have more control of how stable the yoyo stays