T - I understand your concerns. IDK why your income would affect the amount of CS he should pay - SS yes; but, I do not know since I am at the beginning of my S & D.
Good job on logging his interaction with the kids.
Only you have control over the boundaries you wish to enforce and you certainly seem to be on the non-crazy train tracks . But his actions last week will resonate with you for a while to come - and probably not in a good way, either.
And his spending isn't our problem, either, unless he intends to move back in when the $$$ runs out...
I've tried to come up with a reasonable figure for CS & SS as well. We'll have to see how that turns out...
I've tried a number of time to figure out SS & CS to no avail. I'm certainly willing to help and pay what I have to, but, there's no telling what will come of it.
I've taken a second mortgage, raided a retirement account twice and spent a large sum of settlement money on my W trying to start and run her own businesses because she 'doesn't like to work for other people' so I hope that is considered during negotiations.
Not that I don't want to do what's right, but, I feel like I went above and beyond in many aspects WRT to financial considerations. But Florida is a no-fault state so all of this should be just the wobbly end to this roller coaster ride.
. But his actions last week will resonate with you for a while to come - and probably not in a good way, either. 
