I would then be testing to fine-tune where they are placed to find the best balance for now between inside/outside coverage. And this time; staying away from the windows.
Part of that fine-tuning is testing the channels in use at
that node, if possible. Also, I would be seeing if the 2.4GHz band at 20Hz width made an impact too.
The other part of the testing would be to see how close/far from the outside wall the node needs to be placed (and at what specific point, too, along that wall) for the maximum coverage outside.
Don't be in a hurry to find these optimum relationships in your home. Make a change and live with it long enough to allow the surrounding/neighboring AP's to adjust to your home's setup too. Keep good notes of the overall network performance with each change and at the end of a relatively short time, you will have a good real-world map of what is optimum for your current combination of network hardware, firmware, clients and WiFi environment too.