You just said your D was starting pre-school tomorrow which means she would not be without a parent, she will be in school for at least some portion of the day. Do you work? If not how do you support yourself and your D?
Eventually all this trading off you and your EX do will have to change as your daughter grows and her educational and social needs change. It is not feasible to be dropping off a a school age child every few days or at least it shouldn't be. Two weeks on, two weeks off. One week on, one week off. Let your W worry about her childcare and you worry about yours.
And you are still not getting the tax issue. It is not a last resort tactic. It is something you were okay with until your R feel apart and if you were NOT ok with it then you should have been proactive about it when it started... not when a custody fight comes up. It *does* make you sound vindictive and you are just as guilty as your EX is as you knew about it for a very long time and sat in silence until you thought it could work in your favor.
If you were really over your EX you would not care about future children she has or what she does. You spend an awful lot of time chattering about her.
