Admiral Screed

Imperial II class star destroyer

Avenger, sw-7 ion turrets, electronic counter measures, heavy turbo laser turrets

Victory II class star destroyer

Overload pulse

Gladiator I

Demolisher, ACM, ordnance experts, engine techs

2 x tie advance

Soontir fel

Tie interceptor

Minefields, advanced gunnery, hyperspace assault

If an ISD had to take a single kind of upgrade, I would make it ECM. If I had to choose a second, it would be XI-7 turbolasers.

For one more point than you're currently spending in fighter screen, you could take three Firesprays. That's MORE hit points of health, much more anti-ship power that's more effective, and while you lose out on anti-squadron dice, I think it serves you better all-round.