Yes you reached the end circa 250 population. I didn't even think you could reach 450 ! With the happiness constantly going down I guess.
Your guesses are all right, Tesla Towers only redirect on two lightning rods, I planned to make chains but lacked time. No reason to have multiple Weather Centers, you could delete the one you had (but this was a programming error, I wanted to make it so you need to keep one to see informations on storms).
Proximity bonuses are a cool idea ! I have still many ideas for expanding the game, and your suggestions are welcomed :)
All in all, thanks for taking the time to develop your thoughts on this game, this means a lot