link, first of all go in quality, not quanity. Build duel and that zaku xangle qustom (zaku with those beam guns), research burst missile attack and you have problem with fighters solved. Don't invest ru's in Laurasia class destroyers. Upgrade Nazca to max, install beam cannons on them and use them as a repair bases to more expensive units (for example duel, after he's shiel and armour is destroyed, he's a easy target to destroyers) and main strike force. Don't spread Your attack force. The very best and i think only way to take them out is to make one, big battle in which you need to take out as many heavy uniats as You can. Other way it to cut theri resource flow by taking out mobile refineries and carriers (eventualy just collectors).