If that's the established visitation schedule and it's been working out well, then I wouldn't touch that with a ten foot pole. The kids deserve whatever sense of routine that they've been given. Plus teen years come on fast and furious, they'll ditch both parents in a heartbeat. You are on point about growing up fast, appreciate these years.

My custody agreement does have 2weeks vacation each. If she's looking for quality time, then a vacation week could be the right moment.

You do come with kids built in. Is there something about how she is feeling overall about the relationship with you? Is there a sense of distance? Preoccupation? Derived in this? Hence wanting more weekend time alone?