We have the same issue here. We have 50/50 care csa told me that we shouldnt be covering all extras and for most try to work it out with other parent or if we could we could request part of the extras to be part of the child support so our amout payable would be less as we would be including amouts for the extras.
All the added extras add up and most things are included in the care for the children.
Eg if you had 100% care and were receiving payment if the other parent was paying for the schooling it would ruduce their csa amout to you. Does that help lol

pls excuse the spelling mistakes on my galaxcy