Then when the device was tested for compliance they had the highest allowable ERP.
I also think your router does beam forming. Why are you trying to push so much power?
Is it not reaching your entire domicile?
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Did you count (subtract) your antenna gain from that expectation?
ERP - correct! 
Some people think they will get these "raw power numbers". Let me be clear, 30 dBm is 1 Watt (1000 mW). So, one would be illegally transmitting overpower if they were able to set to 30.
Perhaps I misunderstand the OP's issue.
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It reached almost everywhere, on the balcony the signal is not the best, since there are the main walls of the skyscrapers. I wanted to try to get good signal also there.
Do a speed test (speedtest.net is popular) on the balcony and see if what you think is not the best makes a difference in what you would use it for out there.
I'm betting it is fine, but I've been wrong before.
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Also try re-orienting your device if it's near a wall.
I.E.
- Turn perpendicular to wall
- Turn parallel
- Turn 45 degree angle to wall
- Turn upside-down
- Try to move away from wall
Try a combination of above. I had such an issue in a open room before with a WAX202:
Not many people understand all photons are polarized.
I do expect that the antennas are dipoles and that they are already optimized for having the router to stand vertically... or am I expecting too much? 
Maybe presuming, you can expect a lot.
But if your router is not beam forming with its 4 antenna it could help.
What a normal antenna pattern looks like; note there is a null zone directly above and below.
It is, in 3d, much like a doughnut.
And it is polarized.
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