I think because the deflector says:

"The polarized parabolic deflector dish is built specifically to enhance the systems used by, and against, the Breen energy dampening weapon."

Of course that is just flavor text and it can be read in several ways, considering the Set 3 power is the Breen Energy Dissipator I think the intent was this being the Breen set and, as you said, a lot of the powers are set for typical Breen ship weapon layout (Polaron and Transphasic) and abilities (Energy Drain).

Of course if we give it a bonus I would be just one based on the "Victory is Life" but until I see the console I have no idea what it should be since we already have Energy Dissipator in both Set skill and also by console, I can only see some bonus to Polaron weapons as everything was covered by the set.

Honestly, seeing that both the Cardassian Galor Class, and the Jem'Hadar Attack Ship, are both tradeable/sellable on the exchange, and that it is after the winter festival (you know, no one can get these ships in the thousands, making them, at the moment, a rare sight?), why not trade them? I would love to pay upwards from 2-6 mill credits, just to get my hands on this thing, on the exchange. Now that the holiday is over, it would be nice! !