As Cloaky: Crush enemy reclaim with a pair of Glaives, then spam Reavers, then Phantom

As Shield: Crush enemy reclaim with a pair of Bandits, then Thuglaw, then rogue+racketeer or facswitch

As Rover: Crush enemy reclaim with a pair of Scorchers, then prevent further enemy expansion with mass Fencer. Get dominatrix when he tries to counter Fencer with Minotaur, then use your superior economy to dump his base full of Ravager.

As Hover: Crush his reclaim with a pair of Daggers. Spam Scalpel until he's forced to make Emissaries, then kill Emissaries with Halberds. If he porcs, kill his commander and mexes with Lance, you don't need more than one really.

As Amph: Crush his reclaim with a pair of Ducks. Then make some buoys and archers to defend against raids, and make a grizzly ASAP.

As Ship: Terraform a deep hole to put your factory in, then resign.

As Spider: Dont crush his reclaim. Spam Venom-Redback-Recluse. Once he gets Emissaries, you will need to facswitch, but you can also kill him before that. If he makes blitzes, good for you because Fleas eat them alive.

As Jumpjet: Crush his reclaim with a Pyro, kill Kodachis with the same. Kill blitzes with Puppies and feed their corpses to the dogs. Then spam moderator-constable-placeholder and expand. Once he gets to Emissary, either kill it with a Jack, or facswitch.

As Planes: Bomb his mexes with your first few ravens, once you have more than 5 kill his commander. Don't bomb welders or factories unless you have too many bombers, because they are too tanky. Then facswitch to ground.

As Gunships: Kill his initial mexes with Blastwings, then abduct his commander with gnat+herc, or kill it with gnat+locust. Tank AA is expensive, their raiders few and low-dps, so you can get away with a lot of this before he builds up. By then you facswitch.

As Tank: just do what he does, but better.

Anarchid, do you mean that heavy tanks is basically the worst factory on this map? You just described all the ways to destroy it with other factories.