Aw, Hell's Bell's, I'm in!...
That's good stuff, a lot of which can be made relevant to the story at hand without much modification.
Concerning your questions:
The new biotech Jumpships are just coming online as the campaign begins. Sooner regular contact will be re-established.
Latents are very rare. Forced Dunking isn't in any orders policy but let's say any discovered latents is strongly encouraged to go through with the process. Strong Latents are outright hounded for recruitment, especially by the order for which the latent shows a predisposition. There's a little bit of that in 'The Honored Dead', the story that opens the corebook.
Psion aren't mass produced because we're not there yet. They've been on the map for only 16 years by the beginning of the game and while latents are rare, they aren't that rare that we need to resort to that kind of tactics. There's roughly 100k psion by the beginning of the game. 100k in 16 years, not accounting for those who died, that's a lot.
The Prometheus chambers of most orders, especially that of the Legions, are churning out new psions as fast as they physically can and are already working at capacity. Except for the Norca, most Promotheus chambers couldn't handle more latents anyway so there is no call for human farming at the moment.
Why is the Norca under producing (There are 2,000 biokinetics compared to 25k psychokinetics) has to do with ideology. They are outright elitists and are very picky in who they choose to dunk whereas the Legion have your attitude toward psion; they'll dunk anybody as long as he's not a psycho, even if they know upfront the guy doesn't intend to work for them after he's trained. They figure that humanity is better off with another psion no matter what. This tends to indicate that if they don't dunk more people, it's because they just can't. Orgotek and the Docs aren't that more picky.
The real question is why aren't there more Promotheus chambers and that would be telling...