Regarding the KHG effect - I am really not convinced that these "proc on hit" powers make much sense in the first place. We are just hit way too often in PvP for this to be notable different from a 100 % proc chance. If the proc is not just per cycle, but per shot per cycle, it's even less useful. The averge player ship comes with 7 weapons and the average PVP match is 5 vs 5 players...
I think the "once per x seconds" part is the important one.
- Tactical Team is a great power but it lasts too long. I see no reason why TT should last ten seconds while ET and ST only last five. Currently, TT is too easy to chain, and reminds me of the old RSP stacking days.
I've never understood having the same duration for each tier. Give something to investment cost:
Tier 1: 5s
Tier 2: 6s
Tier 3: 8s
10s is too long but 5s should be a minimum start for any skill. Make is worth something to slot that higher skill.