Very good changes this build.
The changes to 4p are both great. Equalizing the proc chance for Ambush & SS builds was necessary.
The changes to ambush are a step in the right direction. It’s unclear where it stands numerically yet, so it might need more tuning to be competitive. HO sacrifices a lot of things to grab Audacity and HO (with HO being locked behind Summarily Dispatched). I still find it clunky that Ambush only generates 4 CP (often 5 as FB). Unless your intention is that it is played only as FB, I think +1 cp on each Ambush attached to HO would go a long way. With the current tuning you either have to finish at 5 very often or you have to overcap a lot of cp (since both PS and Ambush give you 4). Good stuff though, don’t abandon it if it’s not strong enough yet.
Lastly, the KS changes are a bit confusing. It is welcome that KS will hit your main target more often, but why not just make it always hit it? The rng on which target it hits doesn’t add any engaging gameplay, and sometimes it is even worse and it hits immune or 0 hp undying mobs.