You have to be careful with that Bowser Bomb trump gimmick, because you are in essence betting your whole hand on something actually happening. As jero said, it is an all-or-nothing kind of thing. If your opponent actually wises up to that or just knows what they're doing in general, you will be in a complete disadvantage with no stage control at all, even though you two may come off of the ledge within seconds of each other.
Bowser on the ledge is still kind of poop even in this game. It's still a good trick, though. And it's useful for quite a few recoveries in this game (especially those that don't snap--aether, mac/shulk upbs and other weird ones like falcon's)
Bowser's jab is p good. You haven't been using it prior to posting about it?