you cannot see enemy graphs that easily in always war games unfortunattely, requires alot of espionaze.See you the graph of every enemy or don't you make any usage of espionage? I'm not good in playing (look at MS in the DG), but better in intelligence, especial if we have all possibilities.
There is no rounding error in power.
I don't understand, that you (all) 've not enough ESP to see the graphs. I think you know the other civs after few turns and so can give ~80 to every enemy. Who is your goal?