Couldn't you do this a lot cheaper with Howlrunner, 6 TIEs, and a Lamda? It's a hard hitter, but you're making assumptions about dice rolls and ship attacks that aren't necessarily true. I'm also wary about repeated usage of squadron commands to throw dice that may or may not damage a ship just because you can. If you are throwing squadrons like crazy, you're not navigating, and they're getting away from you.
The point of the squadron game is to either occupy their squadrons or bomb their ships, depending on what you want to do with them. You're devoting a BUNCH of points to do one job really well (kill enemy squadrons), but then when you win the squadron game, they are not great at hurting ships. Which lets me and my ships hit yours for very little response. I'd gladly trade 64ish points of my fighter screen for your ISD, any day of the week.