For me, it does count. Because it took me a long time to get used to not responding right away. Because when I did respond quickly, it generally was emotion based and maybe not quite as well thought out as it should have been.
Not that there are perfect ways of saying what we mean or feel.
Just rather that we actually DO NOT say things in the emotion.
So all I'm saying here is, you might say exactly the same thing two days from now. Just wait for a couple days and see if you want to say the same thing...
You might... just give it some time... it doesn't need to be responded to right now...
Make sense?
I think you've done pretty good, but you still weren't practised enough to not take her bait. Use this as an opportunity to practice biting your tongue.
Then... you might respond something to the effect of...
"I am thinking about SC. I am still trying to consider how 50:50 might work and would prefer it over any other option."
OK, I can imagine 50:50 would be hugely difficult if you didn't go to SC. But it will come across as using your S and the courts if you don't get what you want.
Take SC out of the equation. She may bring it up as an ultimatum as well.
But this is about both of you wrapping your heads around 50:50... no matter HOW it might work...