Guis gooing static on the shivans is not the best thing to do since well if they do gather up a couple of Sath's around your door you can be sure they will use the superior numbers of they cargoholds to launch swarming fighter/bommber attacks at you! And you can be sure you will run out of fighters and bommbers before they do! And then what??? You get your arse kicked all over the sistem.
What would be ideal is a combination of tactics fast mobila warfare to lure the shivans into carefully planned killing fields.
I mean lure a Sath into a trap where you have a couple of large warships craging up they m,ain guns to fire on the sath. I mean imagine ships such as the Hattie and the orrion and iceni class friggates waiting for it to emerge then they fire! Sure the Sath is a very roboust ship but even such a ship would do down after just 2 voleis of fire from 20 or more beam cannons firing at it at once.
Edit: Well heres something i usualy think when i'm playng RTS I mean i usualy start of y baiting the enemy no matter how large the force is or how powerfull the enemy force is i usualy start off by engaging the enemy with my light and medium forces sure sometimes they take some damage but if everithing goes oki my heavy forces can get there just in time and suround him while the lighter forces make an escape usualy to the rpair yards

) but by that time the enemy has lost most of his lighter element so he can not oumanouver me and with me attacking from all sides even if he did manage to breack throuigh my tras he would take serious losses and damage to his ships and by that point my lighter forces can just catch up to him and take off his forces one by one! and if reinforcements appear then i just run away. making sure the heavy forces are close by in case i need something to blocade the basterd whyle i ran!

So the same should apply to Freespace tactics reagrding heavy and lighter forces.