We don't have that schedule, but we looked at a year-round school for my step-daughter and did discuss what visitation would look like in that context. We live far away from my step-daughter's mom and she goes to school near her mom. With the traditional school year schedule, we basically have my step-daughter with us any time she is out of school, plus a couple days at Thanksgiving she is not out of school but we pull her out for extra time... with the exception of 1/2 of Christmas break every other year (we think it is important she get to have Christmas day at both houses) and 2 weeks in the summer so Mom can go on vacation with her. My husband goes there to see her every month as well, usually when there is a long weekend from school... but again, we make sure mom gets at least one or two long weekends a year because it is important that she have that opportunity with mom as well.
So, with that as our basis, when we looked at shifting the schedule for year-round school, we basically tried to mimic it as closely as possible. In our case the breaks were approx 2 months in the summer, a month in the winter, and two weeks in the spring, as well as a couple days at Thanksgiving and a couple long weekends. What we planned was to continue two weeks to mom in the summer and the rest with dad, every spring with dad. Winter break would have alternated-- one year the whole break would be with dad, the alternate years dad would have the beginning of break until right before Christmas (I don't remember exactly when the break came). On years that she wasn't here for Christmas she also would come for a week at Thanksgiving. That wasn't a perfect solution because it meant flying out for the week of Thanksgiving, back for two weeks of school, then out again for three weeks of winter break... but it was the best we could come up with. Dad had been granted every Christmas break by the court but was voluntarily giving up half of it every other year, so we talked about taking all of Christmas and not alternating, or giving up less time at Christmas by having her return after Christmas every year, we also talked about dad having an extra week in the summer on years that he lost time at Christmas (instead of making up that time at Thanksgiving) ... no solution was perfect, so we tried to just stick with what everyone was used to (alternating Christmas and Thanksgiving).
We would have continued with the school-year visitation in mom's state as it stood-- on weekend a month, priority for long/holiday weekends, and two non-consecutive weeks during the school year (with dad traveling there, not her traveling here).
In dealing with an uncooperative ex, I would try to make it mimic the current schedule as much as possible and make sure he wasn't losing time overall. From the perspective of the distant family with less parenting time, I actually LOVED the idea of the year-round schedule because it gave us bigger chunks of time spread throughout the year... when she is only here for a week or a week and a half, you feel like everyone is just settling in when it is time for her to go back to school... so he might actually like this schedule change if he is not losing time (and possibly gaining larger chunks of quality time).
Hope that was helpful!