In order to ensure that we have the best chance of capturing clients, we need to ensure that our signal is better than the access point's we are cloning. In the event that you cannot position yourself closer, you can always turn up the power to ensure you have a stronger signal.
To generate a more powerful signal, we can do the following:
iwconfig wlan0 txpower 27
The following shows the result of the iwconfig command. Note the Tx-Power setting: