interesting idea although 15% would be to much, i would suggest 5% every tick.

Ofcourse the bigger fam can just cancel their war declaration.

cancelling war dec means you cant attack for 48hrs if i remember correctly. so no big fam would do that without napping first

this wil stop bigger fams from declaring war because they will lose allot of income and allot fleet sounds kinda cool.

but what is a much weak foe how do you determine who is much weaker 20% ? 30% ?
and what if the smaller fams declare first ?

are some flaws still in it but can be worked out for less farming..
but for now it only stops war declaration.
you can still farm without war declaration

and there is a new tag to clear some1 smalls. no war declaration needed for that

and this will only happen if you declare war once. its like a nuke i guess ? 1 time you destroy 5 a 10% of the cf's of all bankers in the fam ?

Well most effects of a war declaration only come into effect when both families declare war, this could be the same. Just because a small family declares war on you doesn't mean you need to declare back.