Interference Problem

Hello

I have more than 15 mikroTik AP working in 5GHz band around Tripoli city, Libya.
Some with 802.11 protocol and some with nv2.
The biggest problem I face is the interference problem, more than 30 WISP is working in the 5GHz band in the City.

I need some ideas to overcome the interference, I’m thinking to go to 5 MHz channel width, but as all other WISP is using 20 MHz CW there will be no scan results.
As I’m new with Wireless MikroTik world, I need your experience to help me and guide me to the optimum solution
I’m will explain If you need more details.

sorry for my English and thank you.

Check with spectral scan for interference and select channel with no or less interference.
http://wiki.mikrotik.com/wiki/Manual:Spectral_scan

Here is what I am always facing

If I go to 5.9GHZ or 6GHz the Gain will drop and the signal level of registrations will go down and noise floor go to -100 or even -95 sometimes.
Scan.PNG