I find that IG's can't really maneuver through a huge blob of TIEs in front of them, and if you're at range one you deny HLC gunner.
At range 3 you evade since 2 attack dice isn't going to sneak any damage through 4 dice autothrusters. Use evade to try and take only one damage to avoid triggering gunner.
I've stopped these things in their tracks with multiple TIE Fighters stacked in front of one, kept stationary for a few turns to block slow maneuvers, with one just beyond it to block 3 banks and sloops.
All you have to do is spread out your ships into a loose blob that prevents a large base from getting past it.
I've killed an IG before , realized I was up on points, and ran my entire swarm away before for an MoV win against a second, as it takes a few turns for the IG to get back in range of you if you book it.