Agree with reducing power. A common mistake when using multiple access points is to set them all to full power.

Devices usually don’t constantly look for a better signal, instead they look for alternatives once the current connection quality is bad. Some devices will hold on for dear life until it’s borderline unusable.

Unless you’re looking for redundancy, the best case scenario is to have only one good option in every area of your home. That’s not always possible, especially where they overlap, but the closer you can get to that ideal, the more likely it is that your device will make the switch.

You should also be able to adjust the backhaul power separately, so you don’t have connectivity issues between the extender and router.