Thank you for bringing my attention to this part of the documentation. I had missed it at the bottom of the page. (EU Compliance Information - Cisco Meraki Documentation). We were previously missing the spatial stream calculation. Roughly: 4 spatial streams = +6dBi; 8 spatial streams = +9dBi. This explains why our MR56s will not go higher than 12dBm Tx on the lowest 5Ghz channels after August's update.
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