if you have a third Ruckus AP I would abandon the Netgear and run a MESH setup. As for blocking, I would suggest a hard look at either the AP or client logs with particular attention paid NRB Arp tables if you can get them. Part of the issue with the NetGear is it's a consumer device, not a real professional piece, so you're only ever going to get the Zone Director's side of the story (i.e logs).
Also, have you done a survey? Even an informal one like walking around using IPerf Can help you determine your degradation, and perhaps even show you Why. Some times our Wi-Fi issues come from APs having too much power and essentially shouting DOWN the AP clients. Maybe try powering your APs to half, and re-testing.
Best of luck!