How to enable only-n on CAPsMAN?

I wanted to recheck if I turned off B/G modes on CAPsMAN 2.4 ghz network.

First I tried enabling 2ghz-onlyn in profile, but I noticed g/n in the status on CAP, and I also noticed Current rate and Basic rates have OFDM turned on.

Then I tried turning off G rates (B were turned off allready) and OFDM was gone. Now I have BW: 1x SGI: 1x HT:0-15 rates only.

Did I do this correctly, or I hacked a wrong thing?