If there is table space for it someone before mentioned trading range 3 shots. The turret will hit pretty lightly at that range, give ally our interceptors stealth devices and let the guy burn focus to get two dice against 5. Then come back with three against two and you can use focus to boost damage. If he tries to pin you tithe edge, go around his blob and start again from the other side. If he spreads out to deny you your free space focus up on one of his ships.
The guy sounds like the worst kind of opponent, I would really like to read about you schooling him.