disabling is just paralyze and poison, no clue what smothering inflicts. but the proc rate seems pretty decent.
Your HQ bagnakhs beat out a NQ cesti, thats why you have to get a HQ cesti or hora. Used my reg disablings on NMs seems they did lower dmg compared to the other knuckles
If the proc rate is decent like you say and the effect is potent enough, then I believe that this effect alone makes this the better weapon even if Peiste +1 is a bit stronger.
I have not tested this myself (Only 45R atm) but it sounds good in theory :P