I have faced so many trouble while at mass raining.
Pinging of customer AP are reduced to 2ms to 2400ms.
I am now using Mikrotik 411AR with Engenious PCI Card and connected the 18DBI Omni with a 24’ Pig Tail.
You appear to have a physical line of sight or fresnel interference problem and you also appear to be suggesting to use more power to solve the problem thinking that the fault is the with the equipment?
But you have not given any detail about the link itself, the frequency, type of terrain, total distance. We more information we can help better. Messages such as those at http://forum.mikrotik.com/t/solving-20km-wireless-link-issues/30025/1 are a good example of where the better the information you give, the faster it helps to solve your problem.