The last time i played was around the infamous PSI update.
I was running a versatility crossbow with laser pistol backup, relying heavily on ambush to great success, completed Normal/classic with ease and Hard mode was going easy as well.
Life happened and I stopped playing at level 28, halfway through Expedition.
After picking up my last save I Noticed something weird: Ambush didn't crit as much as I remember(which was always). Having 100 skill points and 215 effective and 27% weapon crit(with goggles) on my crossbow, it should bring me to 111% it if Ambush would scale of effective stealth.
Later I realized that the feat specifies that it scales of skill points, so i upped my stealth to 135, that with focus stim gives me 102.5% but i still have plenty of non crit ambush procs.
I'm currently fighting handmaidens and strongmen, don't have any humans around to test.