Place Major Rhymer and several other fighters, including Soontir Fel and at least two Tie Advanced, at medium range of the Assault Frigate and start lobbing anti-ship dice. Keep Mauler Mithel in reserve. The Rebel Aces will be forced to run out of the Gallant Haven's protective bubble to attack the clear medium range threat. They'll be forced to target the Tie Advanceds first. Every time they do, they'll suffer one unsoakable point of hull damage from Soontir Fel's ability. During the squadron phase, send in Mauler Mithel who will then give all the Rebel Aces an additional point of unsoakable hull damage. If the Imperial player has Chiraneau, he can use subsequent squadron commands to move Mauler Mithel slightly to cause yet another point of unsoakable damage on all the Rebel aces.
With all those squadrons tied up and the odds no longer in favor of the Rebels, move in your beefed up VSD to shred the Assault Frigate, which could already be moderately banged up from the squadron bombardment.
Don't get me wrong ... the Rebel aces are very strong. But it's strength 100% dependent on getting the Imperial player to send in his fighters at the Frigate, which would indeed be a very very stupid move. Give them incentive to come to you instead ![]()