Some steps that helped me when I had trouble with it.
First hop: Sounds like the problem you may be having is over correcting by moving the strings too far back for it to land. Making sure that the finger the string is attached to was tucked into my hand (fist like) helped me to keep the wrong part of the string from going under the yoyo.
Second hop: making sure that the string that is looped around both my free and throw hands are closer to the base of my finger.
Double or nothing to Trapeze. I’ve never really had trouble with this part, so I don’t have anything to offer on that.
If your having trouble with the second hop, you can go into a 1.5 mount and move your non throw hand across your throw hand to get into the same formation and practice it from there.