Placement of the ESP8266 on the original PCB was not really thought out. I did remove the copper pour from under the antenna but WiFi signal strenght was not great. Another problem was having just one hole for mounting the PCB in the case, leaving some wiggle to the assembly. Yet another issue with the original boards was that I underestimated how big of a hole in the case was needed for the APDS-9960 gesture sensor to work reliably with the drivers I found. Increasing the opening exposed some of the components around the sensor, so I needed to clear that space out. I have a new PCB version that should address these issues, with a cutout for the WiFi antenna.