people, why do you use amps? 1W amp with 100mW output power on card will give you ~250km reach for your clients! You don't need any amps on links up to 30km... damn.
You have different polarization on client antenna than transmitters one, you use 1W amps... Then, you're wondering why is the mikrotik so bad software.
It is not mikrotik, it is PEBKAC problem. Problem Exists Between Keyboard And Chair.