I think making more mobile carriers would be vital for your strategy.
Quite simply, even if you launched them through a massively long field of grav to get them to reach extreme speeds, to hit someone coming in from the edge of a system, then you may not even hit them. An actual warp drive wouldn't be good- I believe we agreed in the PM that we'd use a tramline system, where true FTL is unattainable, but there are lines between different systems that allow a special drive to take a ship to the other system. This would mean that a special device detects the area where a tramline would start/end, and activating another would essentially launch the ship along the line to the opposite side.

But I'm telling you- you're not going to want super-long-range swarms to throw at people. We'll detect them, we'll have plenty of time to spread out or simply move too far out of course to be hit, or to prepare for arrival. I would suggest more Formic-style instead of launching large swarms too far to ever be recovered. 

Each battle could have you wasting a crapton of resources and soldiers for absolutely nothing- they may not even hit a single ship by the time they arrive. And if you're within range for your gravgun to launch your ships at me with reasonable timing... I'll be able to SHOOT you. It'd be dangerclose for you. Tbh, regular fighters and bombers would probably work better. If I were going for something you are- which I'm actually going to have, in a few scenarios with smaller battles (where a couple destroyers, a cruiser, and a carrier are used, with the rest of the battle being centered around fighters and bombers) then Attack Corvettes (like the tank if fighters are regular cars) would be supporting flight wings of fighters to clear the way for bombers. 

That and I can fire a sublight Devastator missile that would probably wipe out all the enemy fighter-things that would hit my ships. 

like I said- it's not going to be effective. Formic swarms from Ender's Games would be more effective, or traditional roles in space form. Simply launching a bunch of ships like that would be costly and lengthy. 

And if you do blow up parts of my fleet- then the Cirruses will most certainly make sure that your big carrierstation will burn.

You're simply launching a field of nukes at us. I can do that with pinpoint accuracy much faster and easier with a Devastator or a regular nuke. Set it in this spot with a sensor drone, and when the sensor drone detects stuff passing it, it'll set a tiny timer to go off. By the time the first pass the nuke, the nuke would've begun exploding. At that speed, it's like that the explosion may take out all the first ones- and the ones that are rapidly approaching the inferno, incinerating those too, which might detonate and catch even more of yours in the field. 

You're playing a real risky game, by trying to just fire a bunch of big bombs with some amount of control at someone. You'd take a long time to actually fire them off- while a sublight Devastator can reach speeds higher than yours in moments- and they'd be easy to see and everything.

Are you sure that you don't want to change it or anything? Cause... I mean, I would grind them up and spit them out. The warhead will make each one a little expensive, for their size, but they don't really have anything going for them. You're firing a shotgun in space with a massive barrel, except you'd need to fire at extreme, extreme range in order for you to get the shot out before the gun gets blown up.