You should equip the Sub Space Modulator in your extra device slot (+34 All Damage resistance for 15 seconds, -400 proton resistance for 15 seconds, and +15 Defense for 15 seconds).
I'd replace the Transwarp console with with the Assimilated Module which gives you better criticals, +5 to weapons, +5.1 to Hull repair, and +22.9 to Graviton Generators. When paired with the Jem'hadar Deflector Dish you'd get a nice boost to Graviton Generators. I suppose you could switch back to Transwarp computer when not in combat but that would be up to you.
You'll get another tact console slot with the fleet version of the ship put another polaron console in it.
I don't know how you plan on doing your skill points so this all I can tell you for now.
"Live Long and Prosper but always carry a fully charged phaser, just in case!". Arrr'ow