I've played a bit more, and I start to think these "balances" may be gamebreaking. Its turn 200 now, and I'm still flying around with stingers, that's my most advanced weapon. I couldn't affort the 30 terms to research harpoons or anything else, and I basically have to mob up the galaxy with extremely primitive ships. 4 Missle attack, 48 shields, because the defense costs haven't been increased.
I can see that certain key technologies should be a little more expensive, but right now I find the game is becoming unbalanced regarding research time. This is also a problem for the AI, because if it chooses to research a particular technology, it won't get any new technologies for 30-40 terms, and in this way its technological development can easily get stuck.