I think it’s a bit tricky. I’m inclined to think VoC + D&H + tactical awareness is indeed a bit overtuned, but I think there is quite a lot of nuance and caveats that need to be added to that statement.
Firstly base VoC is ok but really nothing amazing. Honestly I might go so far as to say it’d be downright bad with any amount longer cooldown. I’ll admit I’ve never run it without D&H so maybe I’m incorrect on how it works at base but from the description it’s literally just a self toughness heal and AoE stagger. I think that’s debatably worse than base infiltrate, unquestionably so if VoC had its cooldown increased to 45 seconds. I think you recognise this too since you suggest some buffs to go along with your suggested nerfs.
Duty and honour definitely gives a strong effect. And the uptime combined with tactical awareness is basically 100%. You really are best to just spam it off cooldown at that point to keep everyone stocked with overshield, and I do think skill expression with combat abilities should be encouraged. For VoC + D&H it would be more interesting to use if you genuinely needed to think more about when to pop it. Not sure a cooldown increase is required, that would depend on any changes to tactical awareness, which I’ll get into shortly.
Regarding this:
Since it works on coherency range there is already the Charismatic talent right next to good ole Confirmed Kill to increase the range by 50%. I actually think the current range is pretty perfect to make charismatic desirable without feeling mandatory.
Tactical Awareness is generally just kinda cursed even looking at it on its own. Giving a flat cooldown reduction is such a weird choice, giving it effectiveness that scales extra well with low cooldown ults. I’d guess they wanted to further differentiate it from bruiser and psykinetic but it seems like it’s just being different for the sake of it. It should just be like 10% CDR on special kill, 15% if we’re being generous. At 10% I would leave VoC cooldown as is. At 15% having D&H node increase cooldown by 33% (30->40 second cooldown) would be appropriate.
Now the other major thing here I think is the wider context of Vet tree and exercising some diplomacy in how Vet is handled. I personally would not advocate for VoC/Tactical awareness adjustments/nerfs unless they’re packaged with impactful Exe stance/left tree/right tree buffs, ideally weapon specialist QoL buffs too. I think a good portion of the Vet community is still understandably wary of FS Vet balance after the patch 13 changes and the long state of instability Vet experienced in the aftermath.
VoC Vet can make for a very strong support build that drastically reduces the difficulty of a run. I don’t think anyone would argue that isn’t a really strong build. However currently if you want to build around the other trees you’re often playing something that is at worst outright mediocre, or at best pigeonholes your good weapon loadout options to a significant degree. I don’t want Vet mains to feel like they’re getting their shins kicked after so many legitimate concerns have been raised over keystone design, left tree weapon inflexibility, or right tree… general lacklustre options.
Hence again to wrap up. TL;DR I support some nerfs as outlined earlier in this post, but only after/packaged with some reasonable upward adjustments for elements of the tree that have been talked to death at this point