I'm on the last two levels, the one with the big asteroid (thats defended by an enemy fleet btw) that you've got to destroy and the Hyperspace out. Well, the sheer size of the defending fleet is ridiculous to be frank, its absolutely mahoosive and I've tried witha large and reduced fleet to see if it balances and no way is that balanced. I had everything maxed out fleetwise and captured the entire enemy frigates from the bridge of sighs, and I ended up in the last level with, wait for it, two missile destroyer, 2 cruisers, a bucket load of strike craft and vettes and that was it! I had my butt handed to me on the previous level. I've tried reducing the fleet size, scuttling, trying out different groups/mixes of capital ships and still no go, ludicrous number of enemies in the second from last level.
I've played the original Homeworld many, many times in the past and the size of the enemy fleet in that level was a fraction of what I'm looking at on me monitor, which incidentally, the fps went into the red when running fraps, thats single figures, maybe 5-6 frames a second (pc in me sig below for reference), that might give an idea as to the size of fleet I was up against. Really don't know what top do now except experiment and find a happy medium that works