I haven't read your whole thread. Concerning the kids, why is she driving the schedule. You are their father and have equal rights to them.
I know you want to keep things civil. I am concerned that the current custody time is establishing a pattern - one that a court may decide to maintain in the future.
Don't allow yourself to be screwed out of time with your kids because you're trying to be nice. Don't know if I'd trust her that she'll always give you access to them by her own good will.
She's the one splitting up the family and she wants a stable pattern for the kids - with her. I understand that but what about your relationship with them?
Think long and hard about what you want. They also need equal time with you.