I tought myself how to beat the odds by abusing save/load before each major battle.
I had 1 Kol lvl6 , 2 Marzas level 4+5 and 1 Dunov level 4. First thing I see when going into the gravity well is that the entire enemy fleet is on the opposite side of the asteroid and there are hundreds of strike craft vectoring towards me. I replayed this part about a dozen times in order to not lose any caps. What I had to do was turn off all autocasting and keep my fleet in a tight formation and park them near the retreating edge of the gravity well ready to leave.
When the fighter swarms reached me, i triggered the kol's Finest hour and manually triggered flak burst when I could damage the maximum number of bombers. I think I was able to deliver 4 or 5 flaks, but thats all that was needed and just about all of the strike craft had been neutralized. Apparently, killing strikecraft gives a lot of XP, because one of my marzas leveled up to 6, just in time for a swarm of various frigates and support cruisers to show up along with several enemy capitals. I focused fire on the cap and let loose my Missile barrage. The destruction of dozens of ships at once leveled up my other marza into level 6. I opened his missile barrage and finished off most of this fleet and caused them to retreat. But I wasn't paying close attention to the other half of the gravity well, another Empire fleet had moved in. with missile barrage cooldown still minutes away, I hasted a retreat to heal up and come back later.
I learned the power of flak burst then, and I came back with 2 more Kols and 1 more dunov. The reason I reloaded that save so often was only because of bombers. They were doing major damage to my Marzas and costing me to lose it too early. I tempted fate several times and once narrowly escaped with my now level 7 kol at 4% Hull as it retreated
The game I am playing is 1vs 4 hard AI set to research and economy.