If alimony is calculated to equalize our income. Then why would there be child support in top of that???

We will have 50/50 on all of these: 1) child placement 2) asset division 3) income (through spousal support)

We are completely EQUAL at this point.

If I then paid C.S. on top of that then that is all completely extra money for her.

The only thing I can think of is that spousal support is not really calculated to equalize income. Instead, maybe bring us within 70% or something?