(posted in other threads as well in case someone is looking for workaround)
In the meantime, while we wait (and hope) for a firmware fix that works, here is the current workaround:
1) Downgrade the APs to 200.6.10.1.312 (download from Ruckus and select as manual upgrade).
2) Confirm APs are negotiating 802.3at not 802.af PoE. (Assuming PoE source is PoE+.). If APs fail to negotiate 802.3at, speeds will be crippled - particularly the R720. If needed, force the APs to 802.3at via command line. (instructions available from Ruckus website, or I can provide)
Kudos to Basavaraj in Ruckus TAC for working with me for many hours of testing to get to the above temporary solution.
Still baffling to me how this problem made it out the door for two major firmware releases why there was no knowledge base with support for a workaround. A black eye for Ruckus engineering. I hope they can rebuild the trust they had previously.