They do stack. But only tacs have the crit+ trait. I now have base 16.4% critical chance. This is nice. So without two tac boffs I have 8.9% crit and with two tac boffs I have 16.4%.
Leadership trait is still broken though. No increase to hull repair skill stat, and no change to hull repair rate either.
The crith-bonus will definitely get nerfed, even green BOffs have a bonus of 2,5% which is just too much considering that there is not one crith-boosting special console in this league. A bonus of maybe 0,25% for a green one, 0,5% for a blue one and 0,75-1% for purples is more likely.
Anyway, I'm more interested in the cooldown reduction of cloaks and the small damage boost after decloaking. The Romulan BOffs are just perfect for Bird of Preys. I've tested my Bird of Prey with 2 green cooldown reducing Romulans and my cloak is now ready after 17 seconds. Works fine, thank you cryptic for fixing this