Well, I've only played one unfinished game of 6c (up to 2301) so far.
I play noble, epic speed (because I suck, and don't focus all that much on military.)
Anyways, at epic speed noble...
- The tech speed seems good to me, though I can't speak for the end game.
However, because I'm a Network Node/Research Hospital whore, I tend to have the tech lead, obviously. Although that might only be because I play "noble."
But hey, you've gotta know how losers fare as well!
- The Mind Worm/Fungal Tower/Spore Launcher spawning certainly seems healthy to me!
In previous 6b games, any AI marine base was bound to fall to the "barbarian state," and they'd routinely lose other land based cities.
In the 6c game I've played so far, Santiago lost Sparta Command to barbs... and when I... °cough° liberated °cough° New Jerusalem, I has to deal with 8 Fungal Towers, 1 Spore Launcher and 3 Mind Worms surrounding it (date: 2258).
In my 6b games, by roughly 2300 or so, barb spawning usually forced me to have a minimum of 3 defensive units per city + 1 artillery unit per city just to deal with spawnings.
For players who, like me, aren't inclined to devote all they've got to the military, I'd typically not bother with wars or conquest by that point, since repelling spawnings keeps you so busy.
(In fact, I haven't finished a game since constantly fending off new spawnings ends up irritating me too much.)
Another note... In 6b, roads enabled me to dispatch of spawnings quickly.
In 6c, it's another story.
Thankfully, in the one game I played, I only had to deal with a single spore launcher.
No roads almost assuredly means you'll be bombarded before attacking the Sp.L., which will make getting rid of them that much more difficult.
Also, an absence of roads means you can pretty much forget about chasing bears around... I mean Locusts. Just hope it ends a turn next to one of your bases before it destroys too many improvements (or possibly dies attacking one of yer wandering units).
Out of curiosity, does the "raging barbarians" option, if selected in a custom game, increase the spawning frequency?
If so, then you'd be able to have a setting that pleases "builders," and one that'll keep the action oriented warmongers happy as well.
Oh, and, really, I think it might be time to fix the 1st contact diplomacy text.
It still says AI_DIPLO_FIRST_CONTACT_LEADER_PRAVIN_LAL, for example.
Otherwise, the mod's coming along great.
But... I admit it... I really would have loved to play with the Alien Crossfire Leaders/Factions as well.