How exactly did you use this command I mean what file did you edit to put this command?
I used this to try setting frequency to 100:
./cgminer -o stratum+tcp://solo.ckpool.org:3333 -u ADDRESS -p x --gekko-compacf-freq 100
I also tried the same with --gekko-compac-freq 100 instead. Nothing, it stayed the same, 200. Then, I wrote a config file, like in the github issue you shared. I let cgminer create the default by pressing 'W', and then I changed this line:
"gekko-compacf-freq": "200",
To:
"gekko-compacf-freq": "100",
Still, I run "./cgminer" and encounter the same issue. I haven't tried changing gekko.conf in kano's files. I'm trying to lower the voltage by counterclockwise switch, and see how this goes.