On the first turn move within 18" of one of their ships, preferably their lead ship. If you didn't need to all power to engines to do this, launch suicide shuttles with all your ships and only fire phasers. Fire everything in your fleet at one ship, you probably won't do much damage, but you won't be taking any either.
Every turn after that, move back 4 inches and launch suicide shuttles with all ships while focusing on one ship. Keep the suicide shuttles about 8 inches in front of your fleet and don't forget that they move after ALL ships have moved.
In about 4 turns the Romulans will be in range to uncloak and fire plasma torpedoes, this will probably hurt so boost shields or intensify defensive fire to taste, then swarm them with shuttles. By this point you will have about 4 times your total number of ships in suicide shuttles acting as a minefield.
Every turn after that, move back 4 inches and launch suicide shuttles with all ships while focusing on one ship. Keep the suicide shuttles about 8 inches in front of your fleet and don't forget that they move after ALL ships have moved.
In about 4 turns the Romulans will be in range to uncloak and fire plasma torpedoes, this will probably hurt so boost shields or intensify defensive fire to taste, then swarm them with shuttles. By this point you will have about 4 times your total number of ships in suicide shuttles acting as a minefield.