We found a bug with the RF profiles with regards to setting auto transmit power floor and ceilings. The setting isn't followed. Also heard of a bug where MR32s that get RF profiles turn off their 2.4 radios. Currently in Meraki engineering's wheel house. We are eager to try the RX-SOP on a few very high density sites but waiting for the other bug to fixed first before testing/deploying it.
Imagine the AP putting on earmuffs. That's RX-SOP. The AP will not demodulate frames at a certain signal level. While the idea sounds good it should be used cautiously and sparingly because it affects how a device wants to associate. I've used this setting on Cisco WLCs but have never gone above the medium threshold.
CWNE #210 Co-host of Clear To Send Wi-Fi Podcast - http://cleartosend.net
Do you still have any issue with your wireless Profile? Meraki recommended that we should deploy a proper wireless site survey before turning on RX-SOP. The main idea is about to check the channel overlapping within our WAPs. If you use RF Spectrum from Meraki dashboard, you properly can see how badly interferences within those channel.
Another suggestion is that you can switch some WAP to manual channels, and check again. Hoping it may help.