We'd been to this client several times over the last couple years, trying to tweak things. They were coming up to their yearly renewal anniversary - and were considering not renewing this year. I switched them to Cambium and here is the result.
http://community.cambiumnetworks.com/t5/ePMP-2000-and-1000/ePMP-2-4Ghz-Performance/m-p/56574#U56574
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