I read that if you garrote more than 3 targets during subterfuge then all the garrotes you have placed will lose their subterfuge effect and become regular garrotes.
Also that if you garrote a couple of targets during subterfuge and then you use your regular garrote on a different target then all garrotes will become regular garrotes…
My Subt garrotes are always empowered, i can use it max on 3 targets (GCD and haste let’s me), then rest is affected with normal garrote, nothing wrong dmg wise.