Plasma Wire OOS is very solid. It has a decent hitbox for hitting opponents right next to you, and can be reversed to punish bad cross-ups. On hit, it will lead to frame traps at low percents, and tech chases at mid to high percents, and if your opponent SDIs out, they usually fly off with enough stun that they can't punish, because the move is actually fairly quick. It's not like it's super scary, though, but then none of ZSS's OOS options is scary. That's kind of the point. They're all meant to require the player to be mindful of their opponent's tendencies on block. If you want a character that can punish anything OOS with one option, you should switch to Bowser.
As far as doing it with tap jump off (Assuming you mean tap jump off), just roll your thumb from Y to B. Or Claw.