When i was working on a pre-FS1 mod(the one that discovered the unfixeable red alert bug), them first i trough that FS1 was just never intended for anything pre-Shivans, the warships are no balanced, The Orion can single handely murder 2 Typhons, maybe even 3, the Aten never has a chance aganist a Fenris, as its missile battery gives them way too much advantage, not to mention the Leviathan...
Them i finally discovered whats up, the Vasudans have fighter-bomber superiority, and that considering the GTA has the Apollo, Angel, Athena and Medusa in-service (using maybe Phoenix 4 as bombs), the Vasudan idea was just to swarm the area with both cheap things (Anubis), bomber killer things (Horus), deadly things (Seth), really deadly things (Osiris), and ugly-hard to kill things (Amun) maybe thats why the Typhoon has 2 hangars, even considering the Vasudans have no bombs, Furys are effective, and cheap too. And Fenris and Leviathans can turn easily a battle, both of them are deadly, from, the Vasudan POV the Fenris must be killed ASAP, as it can close distance fast and start shooting missiles, and the Leviathan is just overkill, it can kill a Typhon.
The only deveploments after the Shivans are the Ursa, Ulysses, Hercules and Thoth, and all the weapons, but you can guess that the Medusa and the Amun where using some kind of bomb (maybe a slower and interceptable version of the Phoenix V), and the GTA probably had a slower and less acurate version of the Interceptor, both of them replaced before player had access. Having those limited weapons is what make bombers no that affective as they are when the Phoenix V and Tsunamis become avalible.
The result is a really more balanced battle, and a hard one for GTA pilots. There is not much point in more AA defenses as the idea is to kill big things, without shields, the laser turrets somewhat usefull, fighters must do the rest. Under all those conditions if you improve AA defenses, the GTA cant be beaten, pure and simple, the GTA Warships have way too much firepower, you just need to check the number and strength of turrets on a Typhon and on a Orion, a Aten, then a Fenris, the GTA is determined to kill capital ships fast, and the Vasudan to hold them off long enoght for their pilots to give them a edge.
Even a Fenris can kill a Typhon if it can survive long enoght to disarm the turrets, and thats the main problem of Vasudan warships.