Thanks for the advice guys, very much appreciated.
As large fleet battles go, it went pretty well. I scored a fairly clear victory; forced a retreat and pushed them back through the wormhole, albeit with considerable casualties.
By the time it came to the assault orders, my opponent had seriously bulked up. I think the final tally was something like forty Kanrak Assailants, sixteen carriers, a Skinantra, a Jarrasul Evacuator and a multitude of other support and offense vessels (numbering somewhere in the region of 20-30 craft). Thankfully, I suppose, the Kortal was despatched elsewhere and strangely did not join in throughout the entire twenty minute ordeal.
I decided to increase the size of my combat pool, and constructed an additional forty Disciples, more as cannon fodder than anything else, along with a couple more Iconus Guardians, Aeria Drone Hosts and a Scion (to set up a starbase in the system once it was clear). In any event I was still outnumbered, though I felt confident that my combat multipliers (weapon upgrades, shield upgrades, etc.) would outperform the enemy forces.
And they did, for the most part. I jumped in the carrier fleet, defense fleet and Disciple fleets first, let them stir up havoc for the enemy for a bit, then sent in the battleships and Crusaders. I confess I twice considered retreating, as my entire Disciple fleet was wiped out, as were my Progenitors, Defense vessels and Guardians. However I held out and eventually ran them off. Somewhat ironically, all my Radiance-class ships survived, as did the drone hosts and Halcyons. I was also left with nineteen Destra Crusaders, which was pleasing.
In hindsight, it might have been a lot easier had I used more support craft rather than relying on big fleets and multiple capital ships. The Domina Subjugator for example, which I didn't use, might have helped to immobilise the enemy craft and render them ineffective, which could've given me more breathing room. More Iconus Guardians would have been excellent for lessening the amount of damage my main combat vessels took, due to their shield projection ability. I'm not particularly fond of strike craft but admittedly, more drone hosts and by extension more fighters and bombers would have sped up the process of destroying enemy vessels. All this being said, my fleets got the job done.
Advice taken on board, battle won, lessons learned. Mission accomplished. 
