@DavidDancel
From experience with other mesh systems, it could be easily managed by reducing the coverage hence the output power deco station by deco station if the device presents such tuning capability. It will force the mesh to provide you with coverage by working on the station number through back hauling, not by raw force of output power (like telecom operators do with their cellphone tower antennas in urban areas : more towers with equivalent general power in the same covered surface).
Unfortunately my X50 does not present such power management setting : i don't know if your deco model can do this.