I disagree that Gag Order needs a buff. Maybe a Reduction to 2, but certainly not 1.
Sleep is removed as soon as you do anything to the target, making it only significant for a final round move. Even then, if the A.I. wakes them up with some A.O.E., they may still just go in and attack.
While Silence will persist, and is particularly useful on annoying mages.
False. Gag Order sets Silence for one turn only. It does not persist. Enemies don't prioritize waking up other enemies with Sleep.
This is probably the single clearest-cut case of two skills being badly balanced relative to each other. Your argument is completely unconvincing. One AP for Gag Order or a major buff.