@Oce
Did you tune in today to the webinar Migrations to Horn 101? It would surely help you! Anyway, if you miss it soon will be available for watching/downloading :-), stay in touch with RF social platforms!
Took a look into attached pics and i can give you some tips that it may help:
1 -> Channel Frequency is OK, but I still don't know why you are using 10Mhz bandwith if you have a so nice Signal and Noise? If you want greater throughtput then increase APs bandwith to 20-40-60-80Mhz and make Speed tests.
2 -> Altitude its a "must do" in almost any scenario, from physics, higher altitude = the signal travels more distance. BUT, in your case, i see good Signal and Noise, so, it may not be necessary to get much more altitude, unless you want to connect clients that a significant distance from you.
3 -> With 10Mhz channel bandwith you get more stability in you current link, but the throughtput its extremelly capped.
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And they all have a DATASHEET with important information that you must read and understand in order to buy the right antenna that suits your need.
Very happy to assist,
Anything else don't hesitate to reply here,
Regards,
Jorge