Of course, with pleasure.
To reduce the TX Power: In the dashboard, you must go to the section of APs, then select each of the APs and click on the "edit" button (or double click on the AP) after that, you must select the tabs of radios, either 2.4 or 5 GHz, depending on your need.
To modify the aggressiveness to roam in the end devices, you must enter the properties of the wireless adapter, there must be an adapter configuration option, and then you must go to the advanced options, that's where you can modify the aggressiveness with which they roam the end devices.