I don’t think the amount of turns given is the issue so much as the amount of active turns during an FS.

80(160) seems like it would thwart the devastation of an FS but will still allow for the same turn accumulation.
Although after the FS turns will be given very rapidly a successful counter strike would decrease the number of countries that can attack on the second wave thus the same outcome as if you decreased the amount of total turns. Every turn will count more in war chats and will contribute to smarter slower hitting vise click as fast as you can, because defense held will hurt the chat as a whole lot more due to less active turns being available to be wasted.

Also netting clans and people who can not play everyday would not be punished for the actions of clans that start with S