OT, you are right in that stbx's 2nd offer was less 'generous' than his first - and he has stated that he is going to offer less and less each time he comes back with a new 'deal'.
The problem is the level of complication in our financial sitch. He's still refusing to reveal any financial documentation. His deals all involve me paying him, not vice versa, and this is in a context where he has emptied all family accounts before leaving. So, while I agree that he will ask for more if things are drawn out, I don't have much of an option. His 'offers' just don't take into account the debts he amassed in my name and the money that's 'disappeared'.
But I would love to know how to negotiate things without plunging us into out and out, naked antagonism. He would barely look at me in court and although i tried to engage in polite conversation when necessary, he was treating me like a sworn enemy.