How big to go before I stop exploring?

So I did 80 CS last round and was doing 30 bpt. I think its 80 CS now and 25 bpt. Did they re-adjust CS? Or am I just mistaken?

Also as turns go on.. how often should I increase bpt? Or should I just go for a high bpt right away.. like 50+?

Also I think I got top 30 (which is fine since I haven't played in a while) but I'm not sure... do they email final rankings like the old game?

Thanks. :)

I want to try REp Cash in the next express so can someone tell me the correct building ratio (EZ and Res) and a good BPT to get too? I would also like to know what tax rate to run. I havent played in a few years and wanted to find a game like (or almost the same as) Earth 2025 and just like that i did. ;)