Heya ZombieRus, I had a couple of thoughts for the plague race, feel free to disregard them if they're not the direction you are taking the race in!
1st, have their standard weapons do minimal direct damage, but have damage over time(DoT), to give the feel of the enemies ships being eaten away by bio-plasma. I can see it possibly being a problem though if hte infobox gets filled with miniscule DoT lines, so possibly make the ships' DoT effects cumulative, so you end up with a single large value rather than lots of little ones.
2nd, Instead of fighters and bombers, i was thinking it would be cool to have only bombers, and have them suicide onto enemy ships. small squadrons and low health, but rapid build time. Just to keep things fresh! again, there is a downside i've already thoguht of, they would need a different weapon class to usual so that they are effective against LRM spam. To make up for the lack of fightes on the defensive, i was thinking have the flak frigates have no guns, but a damage over time aura, to compensate for the lack of fighter support. That aura would have to replace rather than stack though, to prevent a small clump of flak frigates being untouchable by fighters or bombers.
I hope some of this is food for thought, if nothing else!
Nick