My highest score has been 803 in Ireland but haven't tried France yet. I'm curious as to why you say there is only 32 turns? The solo rules say to follow the rules for the 2 player game, which says there is no set game end. Play continues until all the D buildings are in play and only 3 are left on the display(1 if playing the long game).
Maybe I'm not reading the rules correctly, idk. Uwe puts out some great games, but the rule books included with them are not written very well IMO.
The solo player has an E settlement phase meaning the dummy player will end the game in the 32nd round.
Note that the round sequence is abit different in this phase as mentioned in the main rules (page 8, last part of the solo player rules).