No point protecting useless(in defence) buildings like the Hero Command and Research Lab.
Make your turrets more cluttered together to maximize their potential and increase chances of winning. If you mostly encounter a lot of Jetpack Troopers or any type of infantry, switch some if not all your Rocket Turrets to Rapid Fire Turrets and activate RFT equipment as they are most effective against those.
Looks like you have the armory. If you have the good Guard Reserve equipment–sniper, stormtroopers, bike, MHC(usually for Hoth with the buff)–unlocked, move the barracks and/or factories inside the shields and spread them out within them.
I find that Heroic Defence base layouts are very effective at defending. If you constantly get 3-starred, try switching to one of those.
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