Here is the tactic I use with my Corvette, currently my average K/D ranges from 8-10 during the match.
Loadout: Beams, Blink Warp, Drain Torpedo, Anti-missile Defence and Afterburner
Idea here is to approach they enemy from a far, using afterburners and full boost, but don't blink since that can be spotted easily. Look for their Tac Cruiser first if they don't have one, Artillery. Get as close as possible to it, make sure you have 100 power and focus it on your weapons. Unload on it, if the Tac reacts and gets its shields up, fire the drain torpedo. This will result a dead Tac. Then use Afterburners and Blink Warp, in that order since you can be targeted during the blink. Repeat until you win. The reason you focus on Tac Cruisers first and foremost is because they are always hidden and offer the enemy so much survivability. I have seen so many games go 100 to under 50 because the enemy kept losing their Tac to Corvettes.
Mostly ignore the enemy Dreadnoughts and Destroyers since they have too much health for this build since you don't have the Heavy Torpedoes, if you see one that is getting away with 1/3 of its health, kill it. Just remember, whenever you see Tacs, it is your job to kill them and tip the balance to your teams favour.