There have been a couple posts on gang wars needing an adjustment. Like these:
http://neocw.com/phpbb/viewtopic.php?f=11&t=2785
http://neocw.com/phpbb/viewtopic.php?f=11&t=2638
Here's couple others, with possibly a few elements of those others:
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If we're going to keep the same setup for wars as we have now, then perhaps make only the top ranked members count in gang wars where the numbers are uneven, using the lower of the two numbers. For example, if gang A has 16 members and gang B has 30, then only the top 16 ranked members of gang B count toward the kills for the war.
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Create a different kind of war than the "XXX number of kills in 72 hours" kind.
Perhaps a longer war with the potential to "steal" something from that gang's stronghold. Give it a 168 hour max timer and it can only be declared within the first 24 hours of weekly reset. At the end of the week, the gang with the most kills is said to have penetrated the losing gang's home base and made off with some booty before leaving. The winning gang gets a reward of 1 to 5% of the losing gang's total assets. This "loss" of assets could even be imaginary, in that the winning gang would still get a bonus equal to that amount, but the losing gang wouldn't actually lose those assets. Or maybe they would. Who knows.
This kind of war could require an additional requirement of, say, 10 ECs.
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"Quarter On The Table" ... anyone play pool / billiards? Same concept.
If a gang is already in a gang war, you can still declare that you want to war with them. Have a field that lets you declare how many kills you want (or other type of war), and as soon as that gang is open for war, you have 60 minutes where they can't declare on any gang but your's. This kind of war could also require an additional payment.
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Just tossing it out there as a suggestion I once heard and thought could use some work:
When a war ends, have a one hour period where you can't redeclare on the same gang. This would stop 'farming,' and would also allow for sneak attacks from rivals, creating more activity between the various still active gangs.