My W also asked for a change in our parenting schedule because S7 mentioned being tired when he spent weeknights at my place. She wanted me to do weekends only (but more of them) and I said no. I wanted involvement in their weekdays, school, etc.
I think what you are facing is very common. Your W has anxiety about the separation with the kids, she *may* be subtly influencing them to say they want more time with her (or may not), and the kids are also confused. If you can respect your W’s feelings behind this, while also standing up for what you think is best (having equal or fair time with the kids), things may sort out over time.
Validate her feelings and stand up for what you want and think is best.
