A simple high-tech tactic I've been using is an L-shaped formation. I line my five heavies up on the enemy's left flank, at a 5 or 10 degree deflection and use the 1000 range Kotesus for my base of fire. I only have two per fleet but them, my two corvette flankers, and my torpedo boat secure the base. It's a real pleasure seeing the Warrior lead the charge as it wraps around the flank.

I agree, gunboats are excellent scouts but I wouldn't risk them against a fleet. My ships are teched enough that all I need to see is the total number to be sure of a win.