Only work when u decloak, is a 5sec damage buff. The buff dosn't trigger when u fire clocked from a brel, u need to disable the cloak.
I was with 125aux, and 1 green boff (basic subterfuge) and nobody can see me, at any range. (i think that with 125 nobody can see me anyway, with or without the boff)
When the SCI player used sensor scan, he was able to see me, but minimax that was a 1km wasn't able.
With 63aux (i can't go lower) and the boff minimax can't see me even at 0.01km, without the boff he can see me. When the SCI player used sensor scan, both can see me
And this was with only 1 boff (u can stack 2, one with basic subterfuge, and another with superior subterfuge)
Btw, this boff also breaks cloak animation, is a visual bug but is very annoying because i never knew if i was cloaked of uncloaked, need to check my traybar every time. The bug also affects the stealth stat in the ship stats, u can't see it (so it was imposible know my stealth value with the boff)
Does the damage bonus work properly without the BOFF? I never bothered to check.
How many points in the Stealth skill do you have?
I run my Aux at 118 and have my Stealth skill at 6. Against a sci ship with maxed Aux, I cannot be detected at 0km unless they a) have the Jem'Hadar set, which really only lets them see me at point blank range briefly, b) they hit me with Sensor Scan.
I have an anti-stealth nebula. If you want test stealth, just give me shout in-game. I can see normal bops "aka they do not care much about how efficient their cloak is" up to 15km with sensor consoles and tachyon grid.