What I really want is to continue with the 4-10 but add some time alone with the kids in the middle of the 10. Perhaps an overnight, perhaps even a "pick them up after school, take them to dinner, get them ready for bed, drop them at mom's house".
Why not bring this up in MC and ask her about this? If she says no, ask why. Her response will tell you whether she is being reasonable or not.
Before actually filing for D, one option is to tell your wife that you will be forced to seek legal action if she does not agree to reasonable custody terms (and 4-10 is only 30% which is more than reasonable). If she does not budge, you have a clearer path forward
