I always try to save my double jump no matter who I play, just with Bayo it's a damn near necessity to keep your recovery options open. It's actually a good habit to be in, saving your double jump that is.
As for the WTw, it depends on the fall speed, DI, and weight of the target. But typically (for me) the only thing to do at that percent is really ABK or DJ ABK(sometimes you need to DJ to catch);even if it whiffs you're still underneath or beside the target and can use a falling or DJ rising aerial, even bait a reaction to Witch Time, or just fast fall and punish landing with grab, HS or w/e, all depending on if the target air dodges, jumps, or takes your approach bait.
Something a buddy of mine noticed at TBH6 through friendlies is if you wait longer before doing anything after WTw, you can better position yourself and read your target's reaction. The key is to decide the timing of your ABK quickly (immediate/buffered, slight delay, max delay) however; hesitation makes any follow up more difficult and less true than it was already going to be.
All of that only really applies to WTw1...WTw2 is a different story.