Are you using your IO to power a module/chip or just as a signal? If using to power, voltage will drop the more current the IO will source. This is a simplification, but think of the IOs as FETs with an RDS(on). The more current you'll sink/source, the higher the voltage drop in the chip. According ...

I haven't tried it myself but I think you can specify the config file by overriding SDKCONFIG from the command line. where the config file to use is "sdkconfig-ota".

From ADF README.md (emphasis is mine):

ESP-ADF is based on the application layer of ESP-IDF (Espressif IoT Development Framework). So you need to first install the ESP-IDF and then use the ESP-ADF. Please take a look at Get Started