Full Athena wing, double avenger, topbank Stilettos, lower bank synaptic for wingmen and furies for the player.
Order wing to attack engines, form behind them, launch all stilletos in single fire mode when they start firing.
Switch to furies, kill the Lokis, call for rearm. Use single-launch stilletos or primaries to pick off turrets. Order wing to disarm, deal with fighters when necessary.
You can also try decreasing radar range to 2k, this will help you notice when the Lokis are nearby and help dogfight without getting distracted by other enemies.
STR is overall fairly balanced on insane as it was playtested on it unlike many older campaigns where 'balance on difficulties other than medium' was never given a second thought. You should be able to beat every mission on it if you fly hard and pick the right loadouts.