WA state law calculating child support payment

I live in Washington State. Until recently, my ex wife and I had joint custody of our daughter. There was no child support payments required and we split expenses for healthcare, education, clothes, etc 50/50. The schedule has recently changed to whereby I have my daughter approximately 33% of the time and her mother has her 67% of the time. Now that she is living with her mother more, we are trying to figure out an equitable way to figure out how I can pay her support for the approximately 5 or 6 extra days a month she now has our daughter. She keeps talking about the WA State Child Support Schedule. Our combined incomes are greater than $7,000 so, if I understand the schedule correctly, the amount for a single child is $1,218 per month. Based on this number, I calculated that I would owe her approximately $209 per month based on the extra days she has her. However, my question is, does that monthly figure factor in all the expenses that we normally split as well? For example, her health insurance is covered through her mother's job and I reimburse her 50% of the premium. If we go by the schedule and I pay the $209/month plus the 50% of the health care premium, am I paying twice for her health insurance? Basically, what I am asking is - is the $1,218 per month figure inclusive of all living expenses? Any help with this would be appreciated. Thanks. David