Document all the time you get with the kids above and beyond what is in temp orders. Forget why she is conceding her time to you, in fact, you need to nut up and make this as easy for her as possible. The more you get the kids, no matter the reason (and no, the court will NOT care if it is simply to have more time with her bf's schlong in her mouth), the better it will be for you making the case for additional tme to be built into Final orders.
You need to take a lesson from your STBX...lose your gag reflex about the differences between your morals and hers.
"Personal density is directly proportional to temporal bandwidth."