No matter how much you are actually giving it can only ever be +100 reasons for your enemy to accept a peacedeal. Since his warscore is at -70 and coalition wars get another -50 reasons to accept (and also other minor factors like relative stength of alliance, holds capital and such); It should be literally impossible to offer any deal the AI would accept. Coalition wars are a bit stupid that way.
Not how it works. There is special acceptance code for 'has offered everything we could possibly want without going over 100% warscore'.
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