Use sheild depleting weapons, and tractor beams. Use a lot of Security forces on your ship.
I deplete their sheilds, and then capture their ships. You can also go to ministers, and establish the stratigy that you want your fleet to capture enemy ships.
Good luck.
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"We've made too many compromises already, too many retreats! They invade our space and we fall back -- they assimilate entire worlds and we fall back! Not again! The line must be drawn here -- this far, no further! And I will make them pay for what they've done!" -- Patric Stewart as Captain Picard
UCP/TCO Ship Yards