When you hop up, your hands must move closer together to give it the ability to move. If your hands don’t go closer together, you just dismount a trapeze. Besides that, some people don’t consider it an Eli Hop until your hands touch. So really, that’s the key thing to focus on… pull your hands apart to send the yoyo into the air but as soon as you’ve done that, move them closer together.
Then for the landing, it’s all about pulling the hands apart. When you pull them apart with enough force right near the end (but don’t go nuts… I said “enough” force, not “extreme” force!) the yoyo has NO CHOICE but to land on the string! That’s how it becomes consistent… the timing of forcing that yoyo back to the string.
All the best Eli Hops have the “attitude” of not sending the yoyo straight up, but sending it slightly (or even incredibly) out to the NTH side and then bringing it back with enough speed and conviction that the yoyo comes back to a trapeze faster than gravity would allow it to do.
Watch out for string burn… work up to the really impressive Eli Hops slowly… the more you practice, the more you’ll know “just the right amount” to be strong but yet not get string burn.