I have had experience with ISA and I have dealt with Vree, EA, and Centauri on multiple occasions with them.
For a 5 raid game which is pretty standard I would use 2 Whitestars, 1 Whitestar Gunship, 4 bluestars. The Bkuestars can squadron together along with the white stars and the gunship as another squadron. In my games, squadroned whitestars are very very deadly and if you want you can also use the bluestars as init sinks. Have Both WS with scout so you can not only reroll initiative but also scout for stealth or redirect for molecular pulsars.
EA has slow ships and nasty boresight weapons and a nastier broadside, 1ed they were better against ISA due to anti-fighter weapons but now since they took those away, they will toss plenty of stuff at you. Interceptors mean your molecular pulsars will rarely get through. The EA also deals in plenty of fighters so your whitestars will most likely be using their beams to cut open EA ships you have to probably spend a turn running around them and at all costs, dont go headlong into an earth fleet. (I suggest close blast doors and fire beams). Send your whitestar fighters to kill his fighters and then keep at an escort duty to avoid being shot by anti-fighter
Centauri are close to the manuverability with VOrchans, Kutais and Liatis. Public enemy #1 is the Liati. Kill that first and then go against the lesser stuff. Since Centauri rely alot on foward weapons this usually leaves for little else on the sides so try to flank a centauri fleet. Use your whitestar fighters to hunt smaller centauri ships lacking in anti-fighter or keep them in close escort with your ships.
Vree will give you the most trouble but their hulls are pretty fragile. There is no real way to out manuver Vree with their turret weapons and super manuverability rules. Go head to head and unleash your weapons on the ships. fighters are better off as close escort for your ships as the anti-fighter ratings on so you can intercept their non-beam weapons.