Hi.
We haven't had a strict rule for this, and perhaps its time we tighten this policy.
Basic rules is to keep away from allied and friends faction.
Since diplomacy haven't been focus on the last month, we don't have any list that are up to date.
Well, Tyrant's Club is off the limit, since we share room with them.
Anyone wants to be our diplomacy officer? Make allies and updating this list?
I usually find enemies that are weaker than us in the rating, i also go through the previous records, to see if we have fought before.
If so, i study the activity of them, and who are their key players. If its an old record, the data isn't that much help.
I get an idea on how much points they will get and i see if we can beat that.
Since we now are a target, we need to launch very easy wars, so we can fight back in defensive ones.
To do the best score u get the same for attacking factions in the range of -49 to +49 from our own faction points. The next level up and down is in a 100 range, so -149 to -50. You get the idea.
Regarding infamy. Infamy lower it self with 1 point each day at the main update around 2am CET. If we launch a war like 1 hour before this update that will give us infamy +1 the infamy will be reduced at the update 1 hour later.
Never get more than 1 infamy, and that should be only for a short while.
EDIT: Infamy will now last 24 hour from the time you get infamy. They have closed this bug.