I want it only triggered for level 1 user, so I use the + prefix
And I want it not triggered for ABC, so I add ABC a level 2 user by =2:ABC!*@* (I've also tried 2:ABC!*@*)

But the on +1:deop: script would still be triggered by ABC,
while the on +1:text script wouldn't be

Does it work the same in your mIRC ?