Hi!
1) The Kyrnn...why do they only get 9 pts to customise with
That's a question for developers.
2) The "Cash Crash" or how fast is too fast to expand?
Rule of the thumb: when your treasury is below 2000 BC and when you rise taxes to overall ~50% approval and you're still losing more than 100 BC, it's time to stop, or take some other action:
- go shopping for money: sell tech, extort minors,
- research techs that can give you more money: advanced governments (republic), econ and morale buildings, trade, growth bonuses, sensors...
- start building Trade Centers on colonies with 2B+ pop,
- stop building anything on less important colonies...
2b) how does taxation work in the game?
Check wiki:
Tax.
5) what is the strategy with survey ships,
I use cargo hull with three ion engines, rest life supports. Significantly faster than tiny/small-hull based, and with longer range. How many depends on galaxy size and density of anomalies. In a gigantic galaxy I had 7 of them. In medium one just two.
6) how does approval rating work
Check wiki:
Approval.
BR, Iztok